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Type: Posts; User: wwfeldman

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  1. Closed: Re: Arduino based irrigation controller misbheaving at a particular site.

    the surge protector will make a difference only if one or more of the MOVs are bad (low resistance or shorted)

    are you using the same 24VAC 1A plug pack at home and at the "bad" location?

    if...
  2. Closed: Re: Arduino based irrigation controller misbheaving at a particular site.

    "The 3A DC to DC converter keeps shutting off due to the thermal over load protected being triggered."

    what is it designed to use as input?
    check that the bad location has that input

    I blew...
  3. Closed: Re: how to determine the resistance of a running circuit

    assuming your device has a power input and return, you can measure the voltage across those inputs
    to measure the current, you need to disconnect the return and put in a resistor and measure the...
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    Closed: Re: Proteus PCB Component Problem

    see this thread components are stick together in pcb document
    it started on November 12
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    Closed: Re: What do you know about ANSYS Medini?

    did you google ANSYS Medini?
  6. [SOLVED]Closed: Re: Average vs RMS load-current for LDO design

    in post 4, you said there are 10 identical digital blocks your LDO regulator is powering

    if you have the current waveform for one digital block, since it isn't DC, use RMS to find a measure of...
  7. [SOLVED]Closed: Re: Average vs RMS load-current for LDO design

    I would size this LDO pass element depending on desired Vout, say 5V, drop out voltage, say 1V, so i need at least 6 V in
    the current requirement has to be the maximum current the load will draw....
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    Closed: Re: Processor overheating

    now that its not summer, is it working ok?

    the water cooling idea works if the case is sealed for water
    you may want to look out for condensation inside if the water cooling is cool enough,...
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    Closed: Re: 1MHz Timer Settings at STM32F767

    so 108MHz/107+1 translates to 108MHz/108 ?
    if so, just use 108, not 107 + 1

    if it isn't 108MHz/108, then it looks like (108/107) + 1 = 1.00934 +1 = 2.00934 ?

    108 MHz / 2.00934 = 53.7488 MHz...
  10. Closed: Re: output changes when I touch the enclosure

    i see two possibilities

    by touching the enclosure, you have somehow reduced the pressure and so the current goes down
    0.04 mA is likely well within the design margins of the pressure transducer...
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    Closed: Re: resistor value and power calculation

    in the absence of a schematic, i assume the the load is in series with the resistor in series with the battery
    therefore, your circuit looks like a battery with two resistors, all in series

    the...
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    Closed: Re: Processor overheating

    first, put it in the shade

    then put a fan on the hot spot
    there is some spot somewhere on the case that is warmer than the rest.
    it may not be easy to find, so put a fan on it

    put it on some...
  13. Closed: Re: Regarding UC3844 IC used for PWM switching

    kindly show the entire schematic

    the missing stuff to the right likely has a connection for Isense
    that will aid in answering your question
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    [SOLVED] Re: Why is CO2 a green house gas?

    i am not an expert in geophysics, atmospheric physics, ocean chemistry and physics etc etc
    and i doubt you are

    i have yet to hear from any source that the sun is behaving differently in the last...
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    Closed: Re: 1MHz Timer Settings at STM32F767

    i am not very familiar with STM32F767



    please explain notation 108-1 and 2-1 in
    calculation prescaler should be 108-1, and a counter period 2-1.

    please explain your calculation that got you...
  16. Closed: Re: How can we simulate M/M/1 /∞ using C programming

    i do not understand your notation

    please explain M/M/1/infinity?
    and for completeness sake, please explain "includes AVG. waiting and no. of customers ? "
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    [SOLVED]Closed: Re: digital integrated circuits

    i do not see a question
  18. Closed: Re: Datasheet or Replacement for IC 2003 - BA234980509H

    it might be less expensive to buy a power supply
    it will certainly be less time consuming, especially if you include the time and effort already put in.
  19. Closed: Re: How can I measure AC current with ~500 kHz frequency?

    try a pearson current transformer

    https://www.pearsonelectronics.com/products/wideband-current-monitors
  20. [SOLVED]Closed: Re: What are the names of these voltages for a 3-ph full-wave controlled rectifier?

    its been a while since i did power, so i;m a little rusty:

    the coils are a transformer - provides isolation and step up or step down depending on turns ratios
    as in single phase

    the source on...
  21. Closed: Re: Doubt in the concept of 3 phase thyristor based full wave fully controlled rectif

    its been a while since i did power, so i'm a little rusty:

    KlausST is right there are several issues (several things to discuss) in your post.

    if you follow the current path through the...
  22. Closed: Re: How to generate sine wave using Verilog?

    as FvM says, use the sign bit

    you specified sine and cos as signed values, so the square waves will be specified by sign + or -
    use a statement that checks the sign bit, as FvM suggested
  23. Closed: Re: How to generate Square wave from Sine wave in verilog ?

    same frequency?
    sketch the sin wave, then sketch the square wave on top of it. where along the sin wave if the square wave high? when low?
    now write the appropriate logic statements

    different...
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    [SOLVED]Closed: Re: Multiplexer garbage values

    if the multiplexer is disabled, you apparently do not care about the sample voltage,
    so why does it matter if there is some output voltage? don't look at it

    presumably the microcontroller...
  25. Closed: Re: Heating a cuvette which is placed in a box.

    You might want to use aluminum instead of copper.
    Aluminum is less expensive, easier to machine and the thermal conductivity is not significantly different from copper.

    try a simple mechanical...
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