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Applications of the Audio Operational Amplifier to Studio Use

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The general-purpose dc operational amplifier is adapted to recording studio use. A simplified mixing console design is presented and the operational amplifier is applied to each active element of the console. Circuits are shown for use as microphone, tape, and phono preamplifier, equalizer, compressor-limiter, mixer module, booster and line amplifier, and power supply.

JAES Volume 17 Issue 3 pp. 298-302; June 1969
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AES - Audio Engineering Society