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LINEAR_1_4_VOLUME_EXPANDER

2017-03-02 19:26  
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LINEAR_1_4_VOLUME_EXPANDER
Gain varies automatically with strength of input signal, being lowest for weak signals. Resistors R3 and R4 modify linear control curve to give log curve desired foraudio systems. Overall gain of circuit is about 0 dB at midrange of expansion. Lower pair of LM324 quad opamp sections function as full-wave precision linear peak detector. For stereo, only upper part of circuit needs to be duplicated for second channel.- Linear Appli-cations, Vol. 2, National Semiconductor, Santa Clara, CA, 1976 AN-129 p 7.