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The application of microminiature and miniature operational amplifiers to audio systems is presented with practical examples. Microphone-disc-tape preamplifiers, mixers, line amplifiers, disc and tape equalization, bias and erase oscillators, a cue tone latching detector, a graphic equalizer, lowpass-bandpass-highpass filters, a power amplifier, power supplies and other circuits are described.

Author: Losmandy, B. J.
Affiliation: Opamp Labs, Los Angeles, CA
JAES Volume 17 Issue 1 pp. 14-21; January 1969
Publication Date: January 1, 1969

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Scott Dorsey

Comment posted December 22, 2016 @ 16:55:42 UTC (Comment permalink) This is a very cool summary of a wide variety of useful audio circuits based on op-amps.  Bel used to have a booklet of similar applications notes attached to his catalogue at Opamp Labs.  This paper (or the similar booklet) combined with the Philbrick Op-Amp Applications Handbook is all anyone needs to know to start building complex but working systems with opamps. (Respond to this comment)

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