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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, March 22, 2012 06:43 AM

Master Category List - Dave's Circuits

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Signal Generators Circuits
  • 12V Touch Switch Exciter Circuit
    This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.  It can support a cable length of about 2500 feet.  A typical remote switch circuit is also shown as well as a receiver circuit for those switches....

  • 300v Peak to Peak Signal Generator
    This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times....

    40kHz LED Test Signal Generator
    This 40KHz crystal controlled oscillator circuit drives an infrared LED with powerful 40ma pulses.  The circuit can be used to test optical communications circuits, designed to receive 40KHz modulated light signals....

    Audio Frequency Digital Noise Generator
    When you need to test an audio circuit with broadband noise, this circuit works great. It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly. I included a level control pot.

Dave's Signal Generator Circuits: 
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Signal Generators Circuits

 

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