microphone is fed to PI, which functions as a sensitivity Ell control. A1 is connected as a linear BC 516/51 7 Sept. 77 (E29) Feb. 77 (E22) Spot-frequency sinewave amplifier with a gain of approxi- TV sound front-end mately56portion of the output Feb. 77 (E22) gen rator (E29I signal from A1 is rectified
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