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LIGHT_BEAM_VOICE_TRANSMITTER

2016-04-04 23:21  
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LIGHT_BEAM_VOICE_TRANSMITTER
Opamp and transistor together provide amplitude modulation of LED in accordance with amplitude variations of microphone output signal. Requires only single 9-V supply. Other three sections of opamp are not used. Designed for dynamic microphone. Q1 is 2N2222 (Radio Shack 276-2009).-F. M. Mims, Optoelectronic Projects, Vol. 1, Radio Shack, Fort Worth, TX, 1977, 2nd Ed., p 34-43.