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  1. Replies
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    Re: Coronavirus Alert!!

    Killing time
    https://www.youtube.com/watch?v=bguks572EA4

    https://www.youtube.com/watch?v=zKbMiINmyUw&feature=share&fbclid=IwAR0CWu-mq1CliLey8v1UIZjP2n9alSHpgnsjoT_5FeM4ota0xh7tfKFLyfs
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    Re: Coronavirus Alert!!

    To all my forum friends, keep well and good luck be with you.

    This link is worth a look.

    https://www.youtube.com/watch?v=uGl1YydafxY&feature=youtu.be

    One of my friends sent me this.

    Day...
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    Re: Merry Christmas everyone

    Merry Christmas to all the proton forum members from Adelaide South Australia. Graham regarding the weather, our main air conditioner failed late last week after working reliably for 25 years, a new...
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    Re: Microcap now free

    Lilly the galah can even eat a cracker with only one claw on the perch, I've been meaning to remove the top of the cage so I don't have to clean it, and to feed the black hole. Enclosed is a photo of...
  5. Thread: RS 485 isolator

    by Ken_K
    Replies
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    611

    Re: RS 485 isolator

    Hi Shantanu I do not know what is available so I cannot help with your question. If you have to make your own isolator I would look at digital isolators as they now seem to outperform opto's in most...
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    Re: Phase offseting PWM to prevent noise on fans

    Hi Tim
    The delay line idea certainly has some merit, the cost may be an issue. I had a similar issue driving some large 7 segment displays, the current pulses were a problem on the seemingly well...
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    Re: Microcap now free

    I have just downloaded Micro-Cap 12, and will give it a run at some time.

    Visiting Spectrum Software's home page I discovered the author has served the industry for 39 years, further investigation...
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    Re: Pal signal sampling

    Hi Tim
    A sync separator chip may help.
    http://www.ti.com/product/LM1881

    http://www.ti.com/lit/ds/symlink/lm1881.pdf

    https://www.maximintegrated.com/en/app-notes/index.mvp/id/1184


    I...
  9. Re: New Microchip 16 to 24 bit high speed A/D converters

    Hi Norm
    Thanks for the information. I looks like a very good part, well priced, the price is $5.30 USD for < 25 chips. The UQFN (3mm x 3mm body) will not use up much PCB space. The distance between...
  10. View Post

    This book is well worth downloading.

    Analog Engineer’s Pocket Reference e-book

    Many thanks Texas Instruments.
    ...
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    Level shifting for ADC inputs.

    This post is for information only and may be of some help to some forum members.

    I have found it is is normally best to use the highest ADC input voltage allowable for any particular device....
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    Re: Temperature sensing 100-160c

    Hi Tim

    Have you considered a PT100, they have excellent linearity and for your limited temperature range may need no correction for linearity, simply set at 100 degrees C. I have not used...
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    Re: Setting the A/D range to 1Volt range

    Hi Ken again

    I have just looked up MUX chips, this post is more of an interesting-device-nature.
    I carried out a parametric search on digikey and came up with a 32 to 1 analog MUX.
    ...
  14. Replies
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    Re: Setting the A/D range to 1Volt range

    Hi Tim

    Just some more thoughts.

    If David is correct and the Delta Vfef is 2 volts and you find the resolution limited there are some 16 and 24 bit ADC's with built in MUX on inputs that...
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    Re: Setting the A/D range to 1Volt range

    Stephen
    You are absolutely correct.

    If the Vref inputs are available it is a very good solution. Opamp buffering may still be required.
    I often use opamps to keep my ADC input signals to as high...
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    Re: Setting the A/D range to 1Volt range

    Hi Tim
    I managed to log in on my 5th attempt, wrong password! Maybe because I had an inter cranial aneurysm repaired last week and feel less than perfect or maybe its just me loosing it.

    You...
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    How a PCB is made in China

    This video is worth watching.

    https://www.youtube.com/watch?v=_GVk_hEMjzs


    I have used PCBWay for a long time. The largest PCB I've designed and had made by PCBway has 14683mm of traces, 339...
  18. Re: Tesla acquires Maxwell for dry electrode technology?

    Interesting conversation.
    the Wikipedia Energy Density page says it all.
    https://en.wikipedia.org/wiki/Energy_density
    or go straight to the image...
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    Re: Super capacitors & solar energy

    Hi
    Super capacitors are a very expensive way to store energy. How much energy is required each day? Lithium-ion batteries can be quite economical as can AGM (Absorbent Glass Mat). If AGM are used it...
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    Re: HAs anyone used the TSL1401CL linear sensor?

    Hi Tim

    I thinking outside the box here :courage:
    I noted the tube was 10mm in diameter with a column of water that changes its level. It sounds a bit like a slide whistle.
    The resonant...
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    I dont belive it ! Re: Back in time looking good !

    Mmm


    I remember:


    John Glenn's first orbit around the world.


    The moon landing.
  22. Thread: Barking dog

    by Ken_K
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    Re: Barking dog

    Hi John


    For what it is worth I went down this path over 30 years ago and found.


    1/ Some dogs are deaf.


    2/ It is possible to make unseen neighbouring dogs bark and worsen the situation.
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    ADE7912 galvanically isolated 24 bit ADC

    I have just made a PCBand tried out a ADE7912 and have found it rather impressive.

    It has two galvanically isolated 24 bit ADC's (+/- 32mV input for current and a+/- 500mV input for voltage).
    A ...
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    Re: Electromagnetic display

    Hi pe1pme


    Thanks for the interesting link.
    I am keeping my eye out for a used flip dot display; I like the way they are readable in full sun.
    Standard displays can be almost impossible to...
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    Re: Electromagnetic display

    Thanks Dave
    I have sent them an email re pricing.
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    Re: Electromagnetic display

    Hi Shantanu/all


    I think it may bepossible to read the state of a the “flip-flop” when a device was powered up.


    My idea; If one wrotean OFF state to a segment that was OFF I'm guessing the...
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    Re: Electromagnetic display

    Hi Dave


    I assume they are DC rated. What is their voltage rating? How much power is required to change state?


    Could you supply a part number so I may have a look at the specs? tks


    Ken K
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    Electromagnetic display

    I was browsing YouTubevideos and found this interesting video Electromagneticdisplays.


    https://www.youtube.com/watch?v=_xW0PrurLq0

    and on ebay
    ...
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    Re: Common anode 7-segment display driver

    First off I would liketo thank Dave for pointing me at the CAT4016 it looks like a very cool device.
    It seems to me one chip per every two 7 segment displays and virtually no other components. ...
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    Re: Hot mosfet Do I worry?

    Mosfets actually work fine with reverse voltage on the drain and source up to about 600mV when the body diode conducts, when designing inverters this characteristic is often used to improve...
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    Re: Ferrite transformer question

    Hi
    Just some interesting transformer related links

    Foil winding

    http://slideplayer.com/slide/5292536/


    Interesting winding method for winding high frequency inductors.
  32. Replies
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    Re: Ferrite transformer question

    Hi Charlie

    I was actually talking about placing a shield between the primary and secondary, you are correct if it does not pass through the window it does not count as a turn.
    Enclose is a link...
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    Re: Ferrite transformer question

    Hi Charlie.

    This web site is good.

    http://www.bcae1.com/

    Page 83 Transformer Ratio is good it has a flux density calculator and a skin depth calculator.

    Page 109 Basic Switching Power...
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    Re: Digital power mesurement

    Sadly I don’t know of a simple solution for an isolated DC measurement.
    One could easily make non isolated measurements referenced to the test equipment ground by making a precision high voltage...
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    Re: Digital power mesurement

    Hi Shantanu

    I have no solution to your problem only some comments that may be of some use. I have been working on the design for a 60kW DC-DC converter and found current measurement a problem, no...
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    Re: infrared image of dsPIC

    Seek Pro the newest one.
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    infrared image of dsPIC

    Hi

    I have been working on a high power DC to DC converter (60kW).
    An infra-red camera was purchased so the temperature of various components and tracks could be measured.
    The pcb shown measures...
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    Re: Bike wheel lights go battery-less

    y

    If one wanted to have a leds fixed on the frame with leds pointing forward and aft one could fit say 10 magnets around each wheel and have the leds flash 10 times per wheel revolution.

    For a...
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    Re: Bike wheel lights go battery-less

    Hi Norm

    It does not look too complicated to me, magnets a coil, rectifier and capacitor.
    It should not be hard to replicate, the generated power could be on the fixed bike frame or on the...
  40. Thread: Chip needed

    by Ken_K
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    Re: Chip needed

    Hi

    https://au.rs-online.com/web/p/darlington-transistors/7141167/

    ULN2803A has 8 open collector outputs rated at 50V at low current it should be fine with a 3V input signal, see the RS data...
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    Re: Bike wheel lights go battery-less

    Ok

    As the sync is provided it should be easy to write a message on the spinning wheel or maybe a set of spooky eyes.

    https://www.youtube.com/watch?v=ISeA8ppZwlo

    Easy with a dsPIC

    Ken K...
  42. Thread: LED light bulbs

    by Ken_K
    Replies
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    Re: LED light bulbs

    Hi All

    Wikipedia has a good entry on LED lamps.
    https://en.wikipedia.org/wiki/LED_lamp

    Re current sharing in series collected LEDs, all the lamps will have the same current flowing through...
  43. Re: New Project _ Source Meter and measuring small currents

    How good is good enough?
    I have found the Microchip MCP3553 to be a very useful ADC
    ...
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    Re: EEPROM Program Memory data retention.

    Hi Lester

    I hope you have a Happy and prosperous New Year.

    Thank you for the information.

    Ken
  45. Replies
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    Re: EEPROM Program Memory data retention.

    Hi John and George

    Thank you for your comments, Happy New Year to you both.

    George I was actually thinking of building a tube valve tester to suit most tube types. I have made three prototype...
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    EEPROM Program Memory data retention.

    I was looking at the data retention times given for various PICs and noted some were a little marginal, some examples are given below.



    PIC18F2221/2321/4221/4321 FAMILY

    • Flash/Data EEPROM...
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    Re: Reflecting sunlight automation

    Try use the search term Heliostat

    eg

    https://www.youtube.com/watch?v=rW1XAxbjgNo

    https://www.youtube.com/watch?v=HP3ZWTkkNTU

    https://www.youtube.com/watch?v=KtyKXREPDEA
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    Re: 48V/5V DC-DC converter

    Excuse my ignorance when it comes to phone line specification.
    The schematic shown at https://www.maximintegrated.com/en/app-notes/index.mvp/id/427
    Seems to show a bridge rectifier and a 12 volt...
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    [SOLVED !] Re: Measuring milliohm resistances.

    Hi David

    In a past life I often had to measure milliohm resistances almost daily. The 4 terminal sensing method (Kelvin connections) are the way to go.
    ...
  50. Thread: Where is Fanie?

    by Ken_K
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    Re: Where is Fanie?

    I emailed Faze electronics on the 24th Feb and have not received a reply.
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    Re: Electrical noise reduction for PWM driver

    Hi Tim

    A fairly down and dirty simulation using a FET from the library with a similar Rds(on) running at 20kHz with a 50% duty cycle drive; a 5 ohm load was used I did not want to assume anything...
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    Re: Electrical noise reduction for PWM driver

    Hi Tim

    Good find, if you don't need the speed feedback signal from the motor the Figure 8e. DC-DC mode low side could be a good option.





    2944
  53. Replies
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    Re: Electrical noise reduction for PWM driver

    Hi Tim
    The FET should be large enough for the job, the 220uF 12V capacitor should not be getting warm, it should be a low ESR type and be bypassed with a monolithic ceramic capacitor. BTW not...
  54. Replies
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    Re: Electrical noise reduction for PWM driver

    Hi Tim

    I agree with Rick the mosfet should not be getting hot, the dissipation of the FET should be mainly I squared R losses; even 2 amps with a
    Rds(on) of .01 ohms should only be dissipating...
  55. Replies
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    Re: Electrical noise reduction for PWM driver

    Hi Tim

    There has been some excellent advice given by other members so I have little to add.

    This page may be worth a read.
    ...
  56. [SOLVED !] Re: Circuit simulator and PCB design software - EasyEDA

    I agree with every Les had to say on this one.
    It seems even changes in the windows operating system are a danger to some of the old reliable applications. It seems if it ain’t broke lets fool with...
  57. Replies
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    Re: Voltage limiting to an A/D port

    Hi Tim
    Lots of jet lag here, this may all be rubbish!

    Idea! Use a series resistor of a few k to prevent any damage to the input.

    In software if a voltage is detected near the maximum use a...
  58. Replies
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    Re: Proton & the yuletide spirit

    Shantanu, Lester and all my other friends on the Proton forum.
    May you have a Merry Christmas and prosperous New Year.
    Good health to you all.
    Ken Kranz
  59. Thread: Snow buttons

    by Ken_K
    Replies
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    1,770

    Re: Snow buttons

    The snow is good, unfortunately in South Australia it melts before it gets to the bottom of the screen.

    Its been a hard week, after smashing all the lights I feel a lot happier.

    This evening I...
  60. Replies
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    Re: Can volt regs be stacked for 2x volts out?

    Hi Norm

    You can often stack regulators one thing to watch is the quiescent current of the devices and the actual load current, I have no experience with the MAQ5283 it may be possible to download...
  61. Thread: Max31865

    by Ken_K
    Replies
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    5,712

    Re: Max31865

    Hi Tim

    I have not tried a Max31865, a few years ago I used a number of Max31855 cold junction compensated Thermocouple to digital converters and found them to be excellent. I have used a lot of...
  62. Replies
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    [SOLVED !] Re: Squeeze Ball Using Flexiforce Sensors

    re read your question it seems the part I suggested is similar to the device you intended to use, I would be tempted to place as many senors as possible on a research ball and have pic inside the...
  63. Replies
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    [SOLVED !] Re: Squeeze Ball Using Flexiforce Sensors

    Hi Anuroop

    Some questions, is it to be wireless, how many pressure channels, how accurate do the force measurements need to be?
    Maybe some of these stuck to a ball covered with an outer coating...
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    Optic Fiber recomendations

    Hi all

    I am currently working on a job and need to set up communications over a distance of approximately 200 meters, the RF interference is extreme, the data rate will be <= 10Mbps, due to the...
  65. Replies
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    Good free Toolkit

    This seems to be very good.

    http://www.saturnpcb.com/pcb_toolkit.htm


    Ken
  66. Re: Fairchild's new FTCO3V455A1 − 3-Phase, Variable Speed Drive Automotive Power Modu

    Thanks Norm. another interesting device, the price from Digikey is not that bad.
    http://www.digikey.com/product-search/en?x=0&y=0&lang=en&site=us&keywords=FTCO3V455A1
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    Re: EL34 triode connected plate curves

    Hi David

    Thanks for your comments, your comments about precompliance testing , are absolutely valid, if I have doubts about it passing I won't submit it for testing.

    I don't have copies of all...
  68. Replies
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    Re: EL34 triode connected plate curves

    Charlie David and John thank you for your comments.

    David I'm only planning 1 octal socket and one nine pin socket for the common tubes used in guitar amplifiers, if somebody wants to test an 807...
  69. Replies
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    Re: EL34 triode connected plate curves

    Hi Charlie

    Thank you for your comments, it seems the Colossus rebuild at Bletchley has fashionable knobs fitted.

    I would like to sell the device, one of the problems is the cost of compliance,...
  70. Replies
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    Re: EL34 triode connected plate curves

    Hi David

    It seems to work ok with no dead band, a friend of mine was telling me he implemented a click between menu selections using the on board piezo and it tends to make you think the pot is...
  71. Replies
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    Re: EL34 triode connected plate curves

    Exactly, I guess if you use your imagination they do look a bit like a chicken head, the were used a lot on older guitar/instrument amplifiers as it was easy to see in low light the position of the...
  72. Replies
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    Photovoltaic Mosfet driver

    Product review: Photovoltaic MOSFET driver AVP1121S from National, it seems there are a few manufacturers of this class of product.

    Fanie mentioned this class of device some time ago not having a...
  73. Replies
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    5,017

    EL34 triode connected plate curves

    I have been working on my triode tube tester for testing and matching tubes of the type that are used in guitar amplifiers. Is is designed to test only a few types, 12AX7, 12AT7, 12AU7, (ECCC81,2,3,)...
  74. Replies
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    Re: Analog measurment

    Hi Joseph

    Your problem is a little unusual. Some things that come to mind, if your ADC reference voltage is unstable in any way a low pass filter comprising of a resistor and capacitor from the...
  75. Replies
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    Re: PLL doesn't work with 18F2480

    Hi John

    I have nothing that I can think of at the moment.

    Question:

    Is the chip in a DIP package?

    If so and you have a spare, the chip should plug into my 28 pin 16F1783 test board. I...
  76. Re: Microchip Technology Core Independent Peripherals

    Thanks Norm

    I like this range of product from Microchip
    Here is a link to the microchip site with clickable links to each of the featured modules, it also lists the devices containing the...
  77. Replies
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    Re: Do you have a short story!!! Let's have a coffe!!!

    Be careful out there gentlemen.



    Women often receive warnings about protecting themselves at the mall and


    in dark parking lots, etc. This is the first warning I have seen for men. ...
  78. Re: Maxim Petaluma (MAXREFDES30#) subsystem reference design

    Norm once again thank you for bringing this to my attention.

    I have a lot of time for Maxim chips and cannot remember ever having been disappointed by the performance of a Maxim device. Maxim is...
  79. Replies
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    Re: Win a Million Dollars

    Hi John

    Thanks for the kind comments, unfortunately I don't think simulation would count; in some ways it is a pity as a good simulation should be low cost and close to reality, one of the big...
  80. Re: New Microchip Zero-Drift MCP6N16 Instrumentation Amplifier

    David unfortunately all but a couple pins on the 40 pin 16F1789 are in use, otherwise I would have buffered the DAC with one of the internal opamps, I was testing a chip with a staircase waveform out...
  81. Replies
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    Win a Million Dollars

    Hi All
    It is possible to win a Million dollars using a Microchip PIC and Proton :courage:

    https://www.littleboxchallenge.com/

    go for it all you inverter experts

    Ken
  82. Re: New Microchip Zero-Drift MCP6N16 Instrumentation Amplifier

    Hi David

    There is no way I would use the 1V reference in a commercial device. The actual 1V ref performance testing is simply to satisfy my curiosity, the design has three selectable gain ranges...
  83. Re: New Microchip Zero-Drift MCP6N16 Instrumentation Amplifier

    Hi David

    I would be very concerned about + - 12 counts with the input shorted, not very impressive.

    I changed the pic program to send tab separated values and saved the data as .txt file...
  84. Re: New Microchip Zero-Drift MCP6N16 Instrumentation Amplifier

    I have been looking at the data file from my previous post at the stability of the readings, after setting the pot at lines 13, 43, 74, 190, 250 and 337 and recording the input voltages to the ADC I...
  85. Re: New Microchip Zero-Drift MCP6N16 Instrumentation Amplifier

    Hi David
    Well spotted!

    I had read the chip features and made an incorrect assumption re the 1 volt reference.

    My boards from China have not arrived yet so the project is on hold, I have three...
  86. Re: New Microchip Zero-Drift MCP6N16 Instrumentation Amplifier

    Hi Norm
    Thank you for posting information on new semiconductors I view all the data sheets you post.

    Regarding low drift and chopper stabilized op amps I am about to order some from microchip...
  87. Thread: Need capacitors

    by Ken_K
    Replies
    10
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    2,624

    Re: Need capacitors

    Hi Charlie
    It looks like I may be a little late to be of any help on this post as many good solutions have been offered.

    Is is possible to disconnect and leave the original can capacitor in place...
  88. Replies
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    Re: Buck/boost convertor help

    Hi

    No such word as thent it was meant to be tend!

    The sentence should have read,
    Re measuring the output current, lots of methods would work, I would tend to use a low value series...
  89. Replies
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    Re: Buck/boost convertor help

    Hi Steve

    By now using simulations you would have worked out the need for a good quality coupling capacitor as it needs to carry the full load current, check out the specs on low ESR electro's ...
  90. Replies
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    Re: Buck/boost convertor help

    Hi again John.

    Simple demo sim

    2148

    21492150


    2151
  91. Replies
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    Re: Buck/boost convertor help

    Hi John

    Re CLC filtering, LTspice or any good spice package will give fine results, as always the quality of the results depends on the quality of the simulation and the component models used.
    ...
  92. Thread: Microchip supply

    by Ken_K
    Replies
    7
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    1,769

    Re: Microchip supply

    Geoff
    Some versions October, some in stock.
    Ken
  93. Thread: Microchip supply

    by Ken_K
    Replies
    7
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    1,769

    Re: Microchip supply

    Hi Geoff

    Have you tried Microchip direct?

    http://www.microchipdirect.com/ProductDetails.aspx?Category=PIC18F4685



    :acne: Sorry!
  94. Replies
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    Re: speeding up optocoupler

    Gosh Fanie, not often you pull this face :nightmare:, calm down and thing of something pleasing (not rude :orange:).

    You mentioned the desire to monitor output voltage for feedback purposes, the...
  95. Replies
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    Re: speeding up optocoupler

    Hi Fanie
    You supplied some good information.

    I'm a tightwad and will use a cheap part if it can be made to meet the specification.

    Re the linearising a standard optocoupler I have seen the...
  96. Replies
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    speeding up optocoupler

    As john is now learning LTspice here is 4N25 spice sim.

    I often use optocoupler or RF couplers to the extent of 'if in doubt isolate it'.

    4N25's are cheap and slow, but how slow? They can be...
  97. Replies
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    Re: Buck/boost convertor help

    John
    Be very careful, this spice is very addictive!
    Ken
  98. Replies
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    Re: almost rail to almost rail opamps

    Hi Sparky1039

    Good comments, using an external Vref is a good solution to the problem of measurement near the upper rail limit, external Vref is almost essential if high accuracy is needed.

    The...
  99. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    some spice files.

    21312130

    The SEPIC is worth a look almost PIC ready!

    zero to 50 volts on one range, buck and boots.

    Edit to suit application.
  100. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    I did not find a spice file for a LM393, somebody may post one.

    I did however by using the Digikey parametric search find that Linear Technology do quite a few open collector output...
  101. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    The LT1720 is certainly a lot faster and you have correctly wired it up to a 5 volt supply, it is not however an open collector device and the ouput only swings from gnd to 5 volts, the...
  102. Replies
    21
    Views
    2,983

    [SOLVED !] Re: Best rendition of Mack the Knife ???? ever... ?

    cool :05.18-flustered:
  103. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    A gate drive chip like the MCP1406 will reduce the switching losses in the output FET, remember it's maximum voltage is 18V, will your supply ever exceed 18V, if so this will have to be...
  104. Replies
    21
    Views
    2,983

    [SOLVED !] Re: Best rendition of Mack the Knife ???? ever... ?

    Hi Charlie

    I'm impressed, making an auto changer.

    Have a look at this.

    http://www.youtube.com/watch?v=Iv11Bdx0fTQ

    Imagine making something like this with today's technology.
  105. Replies
    21
    Views
    2,983

    [SOLVED !] Re: Best rendition of Mack the Knife ???? ever... ?

    This very old post seems to be the place for music videos.

    I received this as an email and think it is cool.

    2 performances 47 years apart. FYI, the lead singer of the Diamonds is also the...
  106. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    Congratulations your first sim, thumbs up for that.

    A few things I have changed.

    1/ I added a + power supply to the comparator, just like real life, power required.

    2/ I added a...
  107. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    I do not see your attachment.
    Ok I now see it my appologies, will have a look.

    Regards
    Ken
  108. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    It is possible to have the sim and actual build so similar looking at the scope is like deja vu.

    Up to this point I have been using a perfect loss-less coil, I was intending to put...
  109. Replies
    10
    Views
    2,523

    Re: almost rail to almost rail opamps

    Thanks for your comment Rick.
  110. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Ok this was a quickie.
    Hope it works ok.

    2119

    should go from about zero to 80 volts with a reasonable load.
  111. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    Thank you for your kind words, this has been no trouble for me, I have enjoyed doing it.

    The split plot-pane is a good feature, have you tried it? Right click over the plot pane and...
  112. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Here is a simple boost circuit using parts from the LTspice library.

    2118

    To start, mouse over the schematic, right click and press run.

    To stop, mouse over the schematic, right click and...
  113. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    The sim I sent was to some extent is a a no frills buck converter that demonstrates how they work while you learn how to drive LTspice.

    I used the N-channel FET as it is in the LTspice...
  114. Replies
    4
    Views
    2,165

    Re: Resistor Divider Program

    Hi Fanie

    Thanks for the app, I have installed it and will try it out, thank your brother from me.

    Glad you only said "bit sucking" :smug:

    Ken
  115. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    ARGHHH
    use this less mistakes
  116. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    2113

    I have made up a short LTspice tutorial.
    After opening LTspice one may have to go to
    simulate
    then
    control panel
    then
    drafting options
    and adjust the font size.
  117. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve
    What I think I will do is run up a simple buck converter demo to get you used to LTspice, then a boost, then a buck-boost it may take a few posts to get through, I do think you will be very...
  118. Replies
    10
    Views
    2,523

    Re: almost rail to almost rail opamps

    Fanie you are correct, sometimes I deliberately offset the opamp output to say +100mV when the input is zero volts.
    I almost always spice the circuits before using them as I don't like surprises....
  119. Replies
    2
    Views
    693

    Re: Minimum resistance protection resistors

    Hi Norm

    I also use 220 ohms and have never had a i/o fail even on 5 volt devices.

    BTW I think the output impedance of a pic is about 70 ohms so using a 5 volt supply the current into a 220 ohm...
  120. Replies
    10
    Views
    2,523

    Re: almost rail to almost rail opamps

    Thanks Fanie I will have a look.
    The problem I have had is when the opamp feeds into a pic ADC. It normally evident when the voltage into the ADC is at very low levels.
    A perfect opamp is the best...
  121. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    I did mean MPPT (typo). At its simplest I have found that disconnecting the load every so often and reading the open circuit voltage of the solar panel and then loading it down to a...
  122. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    sorry Steve typo

    this line ..... With Q5 turned on all the time it looks like the 68uH and Q8 with the diode in the source work like a standard boost circuit.

    should have read ..... With Q5...
  123. Replies
    42
    Views
    7,189

    Re: Buck/boost convertor help

    Hi Steve

    I am on my way out at the moment, I have included some links to some good information on this topic.

    I have not seen the exact topology your schematic shows, I am familiar with the...
  124. Replies
    10
    Views
    2,523

    Re: almost rail to almost rail opamps

    Hi RGV250 thank you for the question.

    If you look at the specifications a lot of the chips sold as rail to rail do not actually go right to the supply rails, some outputs are as much as 60mV from...
  125. Replies
    10
    Views
    2,523

    almost rail to almost rail opamps

    I have found some rail to rail opamps don't actually go all the way to the supply rails, often I need to measure all the way to ground accurately.
    Often 600mV of neg supply to the opamps...
  126. Replies
    0
    Views
    1,881

    DAC evaluation AD5791

    Hi All

    This is a short review of a DAC I have just purchased and evaluated.

    The AD5791, this is a very high accuracy device it must be near state of the art.
    ...
  127. Replies
    4
    Views
    1,109

    [SOLVED !] Re: Big thanks Lester & Crownhill

    Re Proton24

    I would like to take this opportunity to thank the Lester and the entire team at Crownhill Associates for supplying such a fine product, we as consumers often take things for granted...
  128. Re: Is anyone making their own PIC24 development board?

    Hi all

    Re development boards.

    I don't want to sound like a stuck record as I've mentioned pmod boards before.
    I am bringing them up again as I have found them a great way to try out all sorts...
  129. Thread: One day...

    by Ken_K
    Replies
    32
    Views
    4,226

    Re: One day...

    John did you happen to follow the links to this page and read some of the comments at the bottom of the page.

    http://australianmuseum.net.au/Drop-Bear

    scary stuff
  130. Thread: One day...

    by Ken_K
    Replies
    32
    Views
    4,226

    Re: One day...

    As this thread seemed to devolve into a dangerous animal thread and then John D let slip re the 'man eating koalas secret' I thought it best to supply some more information re our friendly Australian...
  131. Thread: Printing PCB's

    by Ken_K
    Replies
    13
    Views
    2,282

    Re: Printing PCB's

    Hi Fanie

    I must have a look outside and see what color the moon is for once I absolutely agree with you.

    As far as accuracy goes, my friend is a perfectionist and has spent the time adjusting...
  132. Thread: Printing PCB's

    by Ken_K
    Replies
    13
    Views
    2,282

    Re: Printing PCB's

    Hi

    Have you seen the delta style 3d printers, I helped a friend set one up, it seems to work quite well.

    http://www.youtube.com/watch?v=AYs6jASd_Ww

    Another friend has a a conventional x,y,z...
  133. Thread: Potato Chips

    by Ken_K
    Replies
    2
    Views
    1,537

    Potato Chips

    Hi
    I have been doing some high speed logic lately and have been pushing for higher speed, a colleague suggested Potato Chips, I thought he was joking!

    http://www.potatosemi.com/

    Well is so...
  134. Thread: MOSFET failure

    by Ken_K
    Replies
    7
    Views
    2,403

    Re: MOSFET failure

    Hi Wastrix

    Sorry to hear about the problem, like you I normally fit G S zener's occasionally leaving them out! I like pic-ignorants idea of simulating the fault, you may even non destructively...
  135. Replies
    13
    Views
    4,316

    [SOLVED !] Re: Programmable Switch Mode Control. (PSMC)

    Hi David

    I will post some comments after running the chips.

    FPGA's are certainly cool devices have only used a couple times, big learning curve. Xilinx have made lots of changes to IDE since I...
  136. Replies
    13
    Views
    4,316

    [SOLVED !] Re: Programmable Switch Mode Control. (PSMC)

    Hi David

    I may be a little late to help you with your problem, I have ordered ten 16F783 from Microchip direct with the view to using them in a RS485 controlled high power buck converter ...
  137. Replies
    13
    Views
    4,316

    [SOLVED !] Re: Programmable Switch Mode Control. (PSMC)

    Hi David
    I had not read about using the 64MHz PLLed clock, the device sound better all the time, might pick one up to try next time I do an order.

    I know you are not going to use a DAC, this...
  138. Replies
    13
    Views
    4,316

    [SOLVED !] Re: Programmable Switch Mode Control. (PSMC)

    Hi David

    Sorry I have not tried the 16F1783, the data sheet certainly looks quite interesting, the PSMC module certainly has a lot of features with no less than ten operating modes, it looks like...
  139. Replies
    6
    Views
    1,876

    Re: Bluetooth to serial

    Hi Tim/All

    I have ordered the device you suggested Tim, will report back when I test it. DX dealextreme certainly have some good prices, glad you posted the link.
    BTW this is an interesting...
  140. Replies
    6
    Views
    1,876

    Re: Bluetooth to serial

    Hi Tim

    Thanks for your reply, the device you have looks quite interesting, it is certainly economical.
    Guess I should try one out.

    Ken
  141. Replies
    6
    Views
    1,876

    Bluetooth to serial

    Hi all

    This is simply a question, has anyone tried out a Bluetooth to serial converter?

    http://www.usconverters.com/index.php?main_page=product_info&products_id=228

    I have not searched for...
  142. Replies
    13
    Views
    3,247

    Re: Is there any interest in some Modbus code

    Tim thank you for posting your code, I may have a modbus job coming up in the near future.

    Frizie I would like to see the modbus part of your your code when you are finished.

    Below are a couple...
  143. Replies
    5
    Views
    2,844

    [SOLVED !] Re: Optoisolator using 24v dc

    Hi tkaruna, welcome to the forum.

    There are lots of relay boards for sale on ebay, you might find something suitable, Futurlec also sell a 4 relay board with opto-isolation, I looked at the...
  144. Replies
    7
    Views
    1,899

    [SOLVED !] Re: Eliminating gang error

    Hi Wastrix

    I have found using pots for RF attenuation is not as good as one would expect, have never tried using a look up table as you suggest, it would be interesting to see how it goes.

    I...
  145. Replies
    9
    Views
    1,932

    Re: Strain Gauge measurement

    Hi William

    Thank you for reporting back to me regarding the four layer board.
    The MCP3421 is certainly a very good little chip.
    I have a couple running in 18 bit mode at maximum PGA setting,...
  146. Thread: B H curve

    by Ken_K
    Replies
    2
    Views
    975

    Re: B H curve

    Hi Norm

    According to the web site the cores have a multitude of uses.

    http://www.magnetec.de/en/nanopermr-products/

    http://www.magnetec.de/en/nanopermr-products/emi-cores/

    My interest is...
  147. Thread: B H curve

    by Ken_K
    Replies
    2
    Views
    975

    B H curve

    Hi

    I am simply posting the BH curve of a magnetic material that I have been using that is very good indeed. I have no association with Magnetec apart from the fact of using some of their product...
  148. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    Hi Fanie

    I have put together a simple spreadsheet that may be of some help you when you are trying to determine the efficiency of your device. The spread sheet was created in open office,...
  149. Replies
    9
    Views
    1,932

    Re: Strain Gauge measurement

    Hi William

    The PCB's were actually very good, if your 4 layer boards work out OK, I will use their 4 layer service, so much easier to get the layout correct.

    Re the MCP3423/4 they look good and...
  150. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    Sorry Fanie, I think is it excellent you trying to break the "break the rules", if people like yourself don't try to always find a better way the world would be much worse off. The first time I was...
  151. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    Hi Fanie

    Unfortunately as I understand it there is no free lunch when it comes to heating water or any other substance, water is going to take 4.186 Joules to heat one gram of water by 1-degree...
  152. Thread: Read button pad

    by Ken_K
    Replies
    4
    Views
    1,187

    Re: Read button pad

    Hi

    Another way to read the key pad might be if P5.1 , P5.2, p5.3, all had pull up resistors fitted.

    If SW1 is pressed P5.1 will go low

    If SW2 is pressed P5.2 will go low

    If SW31 is...
  153. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    I wanted to tidy my bench up rather than heat up my big soldering iron to de solder the copper tube I grabbed a cotton tea towel, it was a bit moist, it is now dry and old, will stuff it at the...
  154. Replies
    9
    Views
    1,932

    Re: Strain Gauge measurement

    Hi John

    Thanks for your post, at least I know someone is interested.

    I agree the fixed address is a pain, the tiny package and the ability to locate the ADC where it is actually needed is a...
  155. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    Hi Fanie

    I have performed some I^2R heating tests at 36 Watts by heating some 6.35 OD copper tube. I used a 30 watt toroidal transformer and ran it at 35.6 watts.
    With the primary connected to...
  156. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    i2r heating refers to resistive heating, current squared times the voltage gives power in watts, the idea is the copper heating tube forms a one turn winding on a special transformer, the heating...
  157. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    Hi Fanie

    Is the heating tube in question a permanent part of this device or is it removable?

    If it is a permanent fixture i2r heating may be a possible solution.

    skype ken.w.kranz

    Ken
  158. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    Hi Fanie

    Sorry I am going to answer your question with a question, you stated the tube has water in and you want to heat it to 200 C, do you intend to boil the water off or is it sealed and you...
  159. Replies
    9
    Views
    1,932

    Re: Strain Gauge measurement

    Hi All

    This is an update on my ADC investigations, talking/posting to myself here hope you don't mind.

    Microchip MCP3425

    The MCP3425's arrived so I fitted them to a small pcb I designed...
  160. Thread: Induction heater

    by Ken_K
    Replies
    58
    Views
    5,822

    Re: Induction heater

    Hi Fanie

    I hope you resolved your heating problem.
    I'm doing some catch up on older posts missed by self, induction heating is very handy, we have an induction furnace at work used for melting...
  161. Replies
    4
    Views
    899

    Re: Smoke re-concentrator

    Slightly off topic, this product name sounds fictitious, however "Start Ya Basted" is an actual product, I have a can it my workshop, It proves product naming can enhance sales. It has to be used in...
  162. Thread: Meter Design

    by Ken_K
    Replies
    4
    Views
    1,054

    Re: Meter Design

    Hi Steve

    I guess it depends on the resolution required, one possibility is to use an op amp to invert the input signal and use two ADC channels. One ADC input for the 0 to +80V and the inverted...
  163. Thread: This Forum

    by Ken_K
    Replies
    17
    Views
    2,808

    Re: This Forum

    Fanie

    Merry Christmas to you and your family.

    Ken
  164. Thread: USB Keyboard

    by Ken_K
    Replies
    5
    Views
    2,044

    Re: USB Keyboard

    http://www.hobbytronics.co.uk/usb-host-keyboard

    http://www.hobbytronics.co.uk/manufacturer-hobbytronics/usb-host-board-v2

    might be worth a look

    Ken
  165. Replies
    9
    Views
    1,932

    Re: Strain Gauge measurement

    After much deliberation I have ordered some LMP90100's these look like a very good device, I also ordered some microchip MCP3425 these look like the may be suitable for some applications, the on...
  166. Replies
    9
    Views
    1,932

    Strain Gauge measurement

    Hi

    I am trying to shift away from analog signal processing as much as possible by using ic's with digital outputs, my pressure and temperature inputs are now single chip with SPI output solutions,...
  167. Replies
    9
    Views
    1,202

    Re: Break a beam alert

    Hi Norm

    I like the Omron of the shelf solution, if you want to reinvent the wheel it should not be difficult to obtain the 30 ft range required, I once made (early 80's) an infrared remote that...
  168. Replies
    18
    Views
    3,986

    Re: shin, bit banging, SSP

    Hi Geoff

    Glad to see you resolved both your problems, the SPI 3 wire type communications can be quite a trap with respect to variations in the methods used, in spite of this, or maybe because of...
  169. Replies
    18
    Views
    3,986

    Re: shin, bit banging, SSP

    Opps TRISE lost something

    TRISE = %01000000 'spi bus

    Ken
  170. Replies
    18
    Views
    3,986

    Re: shin, bit banging, SSP

    Hi Geoff


    The MAX31855 is quite a good chip. I have not had a requirement to measure temperatures below zero degrees, if you need to do that the code will need to be adjusted.

    When clocking...
  171. Replies
    4
    Views
    1,248

    Re: Microwave temperature sensor

    Talking about IR detectors how about this.

    Langley’s bolometer appeared in 1880 [6].
    Langley used two thin ribbons of platinum foil,
    connected so as to form two arms of a Wheatstone
    bridge.Lang...
  172. Replies
    4
    Views
    1,248

    Re: Microwave temperature sensor

    Hi Norm

    I cannot think of a good reason why it would not work, one would need a small window suitable for IR and it would need to be kept clean, some sort of a focusing lens may be useful, I used...
  173. Replies
    8
    Views
    1,438

    Re: Measuring 72Vdc with a pic adc?

    Sparky1039 covered this very well.

    I have divided down from 1000 volts with good results, it really depends on the required resolution and speed.

    I am not convinced having the ADC inside the...
  174. Replies
    22
    Views
    4,100

    Re: Inductive power and data transfer

    Sorry flux density about 400 gauss.

    Still working on my books, do we work for self or government?
  175. Replies
    22
    Views
    4,100

    Re: Inductive power and data transfer

    Hi

    I tried removing the ferrite rod and retuning, it tuned at 55kHz and would not light the led, with a rework it could be made to work, the coil diameter would have to increase and the q would...
  176. Replies
    22
    Views
    4,100

    Re: Inductive power and data transfer

    Sorry barak I did not see your FSK comment, good idea!

    A quick test with a ferrite rod 47mm long, diameter 9.6mm.

    It seems to be best if the ferrite rod goes through the coil a little, bit...
  177. Replies
    22
    Views
    4,100

    Re: Inductive power and data transfer

    Hi Geoff

    If your design can cater for a ferrite rod as in the tooth brush charger, it should help. Mav's idea for coms is a good one.

    20 kHz is a good frequency as is is just out of our...
  178. Replies
    22
    Views
    4,100

    Re: Inductive power and data transfer

    Hi Geoff

    The P22 coupler shown in one of the PDF's you posted is interesting, it gives me an idea, if a single coil was placed in each half of a pot core it may contain the magnetic field some...
  179. Replies
    22
    Views
    4,100

    Re: Inductive power and data transfer

    Not suggesting you run at 1.5MHz.
    I was looking on youtube and found this, most impressive demo.
    http://www.youtube.com/watch?v=2ODW-ntPHSU

    I have worked inductive power at low kHz, depends on...
  180. Replies
    22
    Views
    4,100

    Re: Inductive power and data transfer

    Hi Geoff

    Let me get this straight, you are trying to transmit 5 volts at 30mA about 1/2 an inch to power the remote device.

    Some questions:
    The size of the main unit ?
    The size of the remote...
  181. Replies
    18
    Views
    3,986

    Re: shin, bit banging, SSP

    Joseph, thank you for your comments, I have used the single resistor method with success but a dilemma presented itself when I scoped the input and found the pin input voltage exceeded the absolute...
  182. Replies
    18
    Views
    3,986

    Re: shin, bit banging, SSP

    Hi Joe

    Had a look at http://www.protonbasic.co.uk/showthr...ip-Digital-Pot it is actually similar to what I had in mind, look forward to giving it a go.

    Re ADC's I've almost convinced myself...
  183. Replies
    18
    Views
    3,986

    Re: shin, bit banging, SSP

    Joe, thanks for the link will look into it.

    Geoff I use two resistors, not a fan of using the diode they can even slow things down. On the chip select lines I used 1k from pic output and a 1.8k to...
  184. Replies
    18
    Views
    3,986

    Re: shin, bit banging, SSP

    Hi Geoff

    Yes I have it working off a 5 volt system, I used a resistive divider on the clk and cs, on the data out I used a MC74VHC1GT50 ...
  185. Replies
    18
    Views
    3,986

    shin, bit banging, SSP

    Hi

    I have a situation were using the SSP is not viable and shin works fine, the problem is speed, 45kHz is a little slow.
    Is there a simple way to speed it up?
    I have not tried bit banging
    ...
  186. Thread: Aaarrrrghh

    by Ken_K
    Replies
    31
    Views
    3,281

    Re: Aaarrrrghh

    Joe

    Pressure cookers are excellent we have two, one with a dodgy seal. I have often wondered how little energy it would take to cook a meal if one had a fully thermally insulated, electrically...
  187. Thread: Aaarrrrghh

    by Ken_K
    Replies
    31
    Views
    3,281

    Re: Aaarrrrghh

    Fanie

    Sorry about my choice of words I apologize.

    I actually dream of energy independence and feel some level of self sufficiency (power food and water) is to my advantage.

    Your idea of...
  188. Thread: Aaarrrrghh

    by Ken_K
    Replies
    31
    Views
    3,281

    Re: Aaarrrrghh

    Joe

    Could not agree more regarding electric cars, the problem is not the electric motor, they have been good enough for 100 years, the batteries are the very weak link, have a look a the energy...
  189. Replies
    821
    Views
    77,275

    Re: Do you have a short story!!! Let's have a coffe!!!

    The Ventriloquist

    A young ventriloquist is touring Sweden and, one night, he's doing a show in a small fishing town. With his dummy on his knee, he starts going through his usual dumb blonde...
  190. Thread: Aaarrrrghh

    by Ken_K
    Replies
    31
    Views
    3,281

    Re: Aaarrrrghh

    Hi Joe


    Thanks for your comments, due to government incentives at the time the 1500 watts of grid connected solar only cost me $1500.00 ($1.00 per watt) .

    If the panels are producing 1000...
  191. Thread: Aaarrrrghh

    by Ken_K
    Replies
    31
    Views
    3,281

    Re: Aaarrrrghh

    Gary you could not be more correct.
  192. Thread: Aaarrrrghh

    by Ken_K
    Replies
    31
    Views
    3,281

    Aaarrrrghh

    Last night my wife presented me with a letter giving our new electricity costs, the new peak summer rate will be 45.441 cents a kW/h ! :grumpy: Lowest rate 34.9 cents kW/h

    Considering the...
  193. Thread: 0 to 10 v driver

    by Ken_K
    Replies
    25
    Views
    3,167

    Re: 0 to 10 v driver

    Hi Tim
    May be worth considering.

    Some dual mosfet gate drivers come in small packages, have a high z input 0-5v that could be driven straight from a pic with no extra parts, the output is rail...
  194. Thread: Stealing Proton

    by Ken_K
    Replies
    157
    Views
    21,167

    Re: Stealing Proton

    I sympathize with Lester, protecting ones IP and revenue is of major concern to most of us. I do not run any pirated software as I believe the developers deserve to make a living and receive payment...
  195. Replies
    3
    Views
    1,255

    [SOLVED !] Re: Inductor type for coreless DC motor.

    Hi David

    It's years since I worked in the medical industry on peristaltic pumps in those days most were steppers. I can see the appeal of coreless motors and have seen them with planetary...
  196. Replies
    3
    Views
    1,303

    Re: Super Junction BJT's

    My guess is they will be very hardy, no insulating gate oxide layer to break down, reverse gate to source voltage 80V. SiC may be the way of the future.
  197. Replies
    3
    Views
    1,303

    Super Junction BJT's

    Silicone Carbide devices are certainly making an impact! The high voltage SIC schottky diodes (>1000 volts) have saved me a few times. The latest offering seems to be a cross between a FET and BJT.
    ...
  198. Replies
    2
    Views
    1,659

    Re: Common mode chokes as gate drive transformers.

    John thank you for your reply.

    I agree it is worth a Wiki article at some time.

    A couple of weeks ago I required a high energy capacitor discharge high voltage pulse generator, although the...
  199. Thread: Rc Osc question

    by Ken_K
    Replies
    3
    Views
    1,391

    Re: Rc Osc question

    Many years ago b4 my hair went grey I made a sine wave generator that used a 2-r2 network, a pot was used to adjust the pic osc frequency and hence the sine wave output frequency, the osc resistor...
  200. Thread: PCB success rate

    by Ken_K
    Replies
    10
    Views
    2,238

    Re: PCB success rate

    Hi John

    You are a better man than me if you have never had to edit for a third time, I no longer waste a lot of time on checking the first version, it seems regardless of how many hours are spent...
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