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Type: Posts; User: wwfeldman

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  1. Closed: Re: To which standards must we conform for our electronics/electrical product?

    you'll likely need UR (underwriters labs) approval in US
    and CE mark in europe

    no idea what happens in UK after Brexit

    since its cosmetic, there may also be requirements from food & drug or ???
  2. Closed: Re: Sense input current of boost converter use Keysight power supply

    I suggest you look at the manual.

    usually the sense terminals of a power supply are for remote sensing of the power supply output voltage

    using them makes the supply output voltage correct at...
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    Closed: Re: 24VDC Single LED Flasher Circuit

    how important is 50%?
    what frequency?

    is 40% ok? 45%?
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    Closed: Re: 24VDC Single LED Flasher Circuit

    1) you can use the internet to look this up
    2) the process works better when you show the work you did
    what is your circuit
    what do you expect it to do
    what does it actually do
    ...
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    Closed: Re: Shunt in DC ammeter circuit

    As asdf44 said, a voltmeter goes across the small terminals of the shunt.
    Read the voltage and calculate the current using the resistance of the shunt.
    Voltmeters have a very high input impedance...
  6. Closed: Re: SMPS feedback compensation..origin pole is "pole at origin"?

    At the top of page 4 of the ap-note you specified:

    "Offering an origin pole, one zero, and one high-frequency pole, ..."

    in the gain plot of figure 4 on page 5, it appears they put the pole...
  7. Closed: Re: Lamp Test Circuit with some other indications.

    Why don't you wire all 8 LEDs the same way?
    SW1 controls D1, D5 and D9, not D13-D17?
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    [SOLVED]Closed: Re: CD4053 connect unused pins

    no input pin should be left unconnected - analog or digital

    when I have the space, i like putting in a 0 ohm jumper to ground on a pin by pin basis
    just in case, if i need an extra ???, its...
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    Closed: Re: power consumption and temperature rise

    the specific heat of air at 300 K is 0.718 joules/gram Kelvin
    your resistor is dissipating 0.005 W, or 0.005 J/second

    it will take 144 seconds, (2 minutes and 24 seconds) to dissipate 0.718...
  10. Closed: Re: Where can I find a list of good quality brands for DC-DC power supplies?

    you need to match the requirements to the supply

    as you listed capacitor manufacturers, i will list poewr supply manufacturers
    these are likely more expensive than what you've already looked at...
  11. Closed: Re: Looking for a suitable DC -DC buck conveter topology

    I suggest putting the voltage detect on the output side of the shunt (right side in your picture) instead of the
    regulator side (left) as you want the output voltage, to be correct, not a little...
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    Closed: Re: Exact resistance output?

    analog MUX, not digital MUX
    pay attention to the resistance of the switch itself

    through hole or surface mount does not matter, provided the components do not overheat
    and it will fit in the...
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    Closed: Re: Exact resistance output?

    you have a 10k pot with 256 steps, one of which is 0 and the other is 10k
    the step is approximately 39 ohms (10,000/256)

    the available values closest to your desired resistances:
    you can have...
  14. Closed: Re: Digital Storage Oscilloscope - newbie questions

    The screenshot on the left shows about 7 mV peak to peak ripple (scope says 9.20 mV peak)
    without checking the specification of the TL431, that's probably about right

    armed means the scope is...
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    Closed: Re: Generating the waveform as in the image

    your drawing shows the 27 MHz blast starting at 0 and falling
    and ending at 0 and falling
    how important is that?

    a 2 ms burst is 54240 cycles of 27.12 MHz
    how important is that?

    what is...
  16. Closed: Re: PV with Arduino and 12Volt Sealed Lead Acid battery

    the load position of the charger goes to the load
    same two wires, same points, except for minor voltage drop in wires

    "high side" is used when discussing power converters
    certain types of power...
  17. Closed: Re: PV with Arduino and 12Volt Sealed Lead Acid battery

    When charging, the solar panel and the charger will safely charge the battery

    the battery does not "need" current
    it will provide the current the load requires, at 12V.

    the energy contained in...
  18. Closed: Re: PV with Arduino and 12Volt Sealed Lead Acid battery

    as you have written:
    the solar panel provides up to 2.5 A short circuit current, less under normal use
    4 mm (about 6 AWG) is a bit big 2mm (about 12 AWG) should be big enough
    how big a wire can...
  19. Closed: Re: Gate and Collector of IGBT is showing short

    the symbol in your schematic is a PNP transistor, not an IGBT
    are the IGBTs in correctly?

    Phase R goes to the motor
    please show the motor and the the remaining circuit

    the motor runs, but is...
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    Closed: Re: USB to PS/2 adapter, how does this work?

    im sure the internet has an explanation of how it works

    this sort of thing is easier to buy than build

    https://www.newegg.com/Mouse-Keyboard-PS2-Adapters/SubCategory/ID-3024
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    Closed: Re: Voltage regulator... proportional?

    The adjustable SMPS input is the whole 3S, as noted above
    The output is your desired voltage, 4.2V to 3.4V, based on LiPo at 12.6 to 10.2V

    you should be able to adjust the feedback voltage...
  22. [SOLVED]Closed: Re: Problem in designing proper voltage shifter

    your signal varies from 0 V to 12 V
    how fast does it vary?
    or, how often does it change?

    Klaus is correct, a resistor divider is the simplest solution
    i like the op amp follower so you do not...
  23. [SOLVED]Closed: Re: Problem in designing proper voltage shifter

    op amp 3554Am has a gain-bandwidth product of 1.7 GHz and a slew rate of 1000 V/us
    what is the highest frequency you expect to use in this circuit?
    are there any other requirements of the op amp...
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    Closed: Re: Looking 4 collaboration: Mobile Display

    this meets your size
    https://www.newegg.com/p/0JC-00A7-00005
    no idea if it meets your requirements
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    Closed: Re: Digital input of high voltage

    is the 150V the input or desired output?

    if 150V is the input, what is the desired output?
    if 150V is the output, what is the desired input?

    what voltage levels for digital input? TTL? CMOS?...
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