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.
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https://aes2.org/publications/elibrary-page/?id=1610
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