Very low voltage noise generator

Discussion in 'The Projects Forum' started by skrapmetal, Sep 15, 2011.

  1. skrapmetal

    Thread Starter New Member

    Sep 13, 2011
    2
    0
    I am figuring out a way to generate a 1Hz 0.01V pulse to inject a little noise into a 1V supply in order to slightly agitate a monitoring circuit so it thinks the input is "real" and not artificially provided.

    I have designed and built it with a 12VDC->1.5VDC voltage regulator powering the motor drive circuit of a cheap quartz clock, and then sending the stepper motor output to a voltage divider to give me about 0.01V pulses. It works like this but it's hardly robust and is certainly not elegant.

    Anybody here know a better way, preferably one that can be potted? Any help would be appreciated. Thanks.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,056
    Do you just need a square wave? Look into using a 555 timer IC to make an oscillator.
     
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