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Type: Posts; User: wwfeldman

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  1. Replies
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    51

    Closed: Re: Introductory literature on PLD

    good start
    read the data sheet
    get a development board and download the software
    go through the examples

    when you run into a problem,
    show the work you did, what the computer told you,
    and...
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    91

    Closed: Re: Converting drill file in um to mm

    i think you did good
    you can stop banging your head against the wall

    my apologies about the metric system lesson
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    Closed: Re: Interdigitated capacitors

    same as any other capacitor
    basic model two plates, area A, charge q, separation d, dielectric k, etc

    then there's another one in series
    and another in series etc
    ...
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    Closed: Re: Converting drill file in um to mm

    mm is millimeter, 10^-3 m
    um is micrometer, 10^-6 m

    converting requires moving decimal point 3 places corresponding to multiplying or dividing by 1000,
    depending one which way you're going.
    ...
  5. Closed: Re: Stacking diodes for high voltage rectification

    100 uf4007 plus 100 R & C for snubber plus 100 voltage sharing resistor
    vs
    10 K50UF plus 10 R & C for snubber plus 10 voltage sharing resistors

    now compare board space, parts cost, inventory...
  6. Closed: Re: Will I be able to drive LED with attached analog circuit ?

    i think it will work
    but the LED is always on, and there are simpler circuits to just turn on the the LED
    at 3.5 mA the LED will not be very bright.
  7. Closed: Re: stacking diodes for high voltage rectification

    see this thread
    Bridge Rectifier won't Rectify

    you would need some way to guarantee that all of the diodes carried their share of the voltage

    since the uf4007 is rated at 1000 V, 100 of them...
  8. Closed: Re: Potential Energy and Kinetic Energy of an Electron in an Energy Band diagram

    An attempt:

    as you know:
    consider the bohr model of hydrogen:
    an electron can orbit the nucleus only in specific quantum levels
    the lowest level, n = 1, is at -13.6 eV
    the next level, n = 2,...
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    Closed: Re: damaged remote control

    treat it like a wet cell phone

    put it into a container with rice all around for a day or 2 to dry it out
    get all of the rice dust off it
    then put it back together with a fresh battery.
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    Closed: Re: Single conductor inside hollow conductor

    if anyone wishes to continue he discussion of potential, emf and voltage, etc,
    please start a new thread under physics
    as this seems somewhat far afield from kajunbee's question
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    Closed: Re: Single conductor inside hollow conductor

    @easy peasy
    emf and potential are both measured in volts
    when the "voltage" is caused by charges, it is potential and the potential difference between two locations is the voltage we measure
    when...
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    Closed: Re: Whats the best way to ESD damage a PCB

    it also depends on the humidity in the air
    this time of year, north america, europe etc have relatively high humidity and
    static charge does not build up

    if you did the carpet shuffle, or the...
  13. Closed: Re: 1 minute vs 1 second isolation voltage test for isolated offline SMPS transform

    this test is accomplished by tieing all of the primary leads together and all of the secondary(ies) leads together
    and then applying 3750 VAC

    3 mA seems like a lot of leakage
  14. Closed: Re: 1 minute vs 1 second isolation voltage test for isolated offline SMPS transform

    the transformer tested for a longer time is likely built better

    i expect more critical application require a longer isolation test

    what is the 3mA about?
  15. Closed: Re: Nominal current of diode bridge rectifier

    the data sheet says rectangular pulses, 1/3 of the time, as noted above, 90A output current

    conduction by any one diode 1/3 of the time is the most one would expect from a 3 phase sine wave input...
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    [SOLVED]Closed: Re: 12 vdc led running very hot

    please provide the circuit the LEDs are in, the part number of the LED
    and any known voltages or currents
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    Closed: Re: Isolate R37 from Equation

    try this:
    apply voltage divider at the + input of the op amp V+ = ...

    assuming a perfect op amp, V- and output = V+

    combine R25 and R28 to one equivalent resistor

    assuming Vo is open,...
  18. Closed: Re: Drive motor through IRF520 MOSFET module and Arduino

    please draw the circuit for the arduino, the MOSFET Drive Module and the motor
    show the connections between the arduino the mosfet driver and from the mosfet driver to the motor
    show all voltage...
  19. Closed: Re: How to use the same RELAY on 12V & 24V vehicles

    what load does the relay handle? V? I? etc

    Kyotto makes a series of solid state relays with a control voltage range of 4 to 32 V

    load voltage ranges 24 to 280 VAC and currents 10, 15, 25, 40,...
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    Closed: Re: Single conductor inside hollow conductor

    @easy peasy:
    potential (voltage) is the energy per unit charge based on static charge distributions
    things where we use V = sum of kq/r or integral thereof for continuous charge distributions
    ...
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    Closed: Re: HP 54520A Blown Fuse Problem

    suggestion:
    find an identical 'scope on ebay or a used equipment place
    get it for spare parts
    if it turns on, but the 'scope doesn't work, you have a new power stage

    useless suggestion:
    when...
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    Closed: Re: Single conductor inside hollow conductor

    the outer conductor of coax is usually stranded and woven
    if it was solid, like a pipe, it wouldn't bend.

    when i asked where the return path was, i did assume a current
    as you know, there is...
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    Closed: Re: Single conductor inside hollow conductor

    yes
    where is the return path of the AC current?
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    Closed: Re: OP07 circuit output voltage?

    this question appeared in this thread
    13.9 V instead of 2.75 v, Which parts are failing?

    so my question is what are umsch1 and umsch2 connected to?
    umsch1 is directly connected to the...
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    Closed: Re: What dc can u measure?

    assuming sinusoidal waves, and since there is no apparent load, all three circuits act as peak detectors.

    If Veff is Vrms, then Vpeak = sqrt(2) * Veff or Vpeak = sqrt(2) * 20,5 V = 28.99 V
    ...
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