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Circuits designed by David Johnson, P.E.

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Last Updated on:  06/17/2009 03:29:12 PM

Charge Pump Circuits    Crystal Oscillators   Infrared Circuits

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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.

Circuit 40KHz LED Test Signal Generatorr designed by David A. Johnson, P.E. (March 12, 2002)

Charge Pump Circuits     Crystal Oscillators    Infrared Circuits

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