Tremolo amplifier circuit

Published:2011/9/9 2:24:00 Author:John | Keyword: Tremolo amplifier | From:SeekIC

The amplifier utilizes undersonic frequency (usually 5 ~ 15Hz) to do amplitude modulation for the audio input signal. The used National's LM389 IC contains three transistors and a power amplifier in the internal array. These transistors constitute the differential pair and active current source tail end. The differential amplifier output is proportional with two input signals’ product. Gain control potentiometer is used to adjust the desired tremolo intensity. R, C network within levels constitute the 160Hz high-pass filter and the tremolo frequency is required below 160Hz.



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