Audio Frequency Counter


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  1. #7
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    I built one (actually several) back around 1971 in high school electric shop, used an audio transformer secondary to speaker and primary to the gates of 3 SCRs through 3 R/C filters for 3 channel outputs to control 3 strings of colored lights put behind diffuser panels made for fluorescent lights. Wow shades, some Metal music, some get high, and who could even think of going to war ?
    Back on topic . . . R/C network, Analog voltage detection, digital output . . . same theory should work.
    Last edited by Archangel; - 29th July 2009 at 06:33.
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