TREMOLO_AMPLlFIER

Published:2009/7/1 20:40:00 Author:May | From:SeekIC

Provides amplitude modulation at subaudio rate (usually between 5 and 15 Hz) of audio-frequency input signal. Uses National LM389 attay having three transistors along with power amptifier. Transistors form differential pair having active currentsource tail to give output proportional to product of two input signals. Gain control pot is adjusted for desired tremolo depth. Interstage RC network forms 1 60-Hz high-pass filter, requMng that tremolo frequency be tess than 160 Hz.- Audio Handbook, National Semiconductor, Santa Clara, CA, 1977, p 4-33-4-37.



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