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making something for the first time

Discussion in 'Electronic Basics' started by [email protected], Nov 17, 2006.

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  1. Guest

    hi
    i have to convert 50V analog at 100KHz to 50V digital at 100KHz, so i
    need help, like how do i proceed what is in my mind is to step down the
    voltage 50V to the one that can be fed to an A to D converter IC and
    then may be i can then use a DC-DC amplifier to bring the voltage to
    50V, and will i need a frequency conversion also in between.
    i would appreciate your help.
    regards
     
  2. jasen

    jasen Guest

    need more details... what sort of digital, etc...
     
  3. Impossible!
    Minimal sampling rate is twice the frequency of the source.
    Actually you want to recreate a known function by sampling it and
    rebuilding from samples.
    Simplest would be to build (or buy) an old HP vacuum tube oscillator at
    100Khz and take the output from a tap on output cirquit.
    But if we are in this game then:
    a) Is the sampled quantity 'perfectly' defined as to waveform and
    frequency then there is no need to sample.
    b) If the sampling is for finding 'imperfections' then the sampling has
    to be fast enough to find and record those faults.
    c) Now you have to rebuild it in the D/A portion and amplify to whatever
    level you want. (Did you think about calibrating signal to tune all
    stages from input to output for linear response?)
    What are talking about? To amplify the digital numbers on output of a/d
    sampler to 50V level. What for? You feed those numbers to d/a, both of
    them clocked by common clock and this keeps the frequency in sync.

    HTH

    Stanislaw
     
  4. jasen

    jasen Guest

    a schmitt trigger rated for those voltages would do it.... but possibly not
    what the OP wants...
     
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