VOICE_AMPLIFIER

Published:2009/7/16 3:45:00 Author:Jessie | From:SeekIC

Includes audio preamp, RC active filter, audio output stage, and voltage regulator, operating from 12.5-V supply rated 300mA or more. Developed as low-distortion audio amplifier for communication receiver.Two taps for regulated supply provide regulated 8.5 V at 250 mA for other circuits. With filter out, changing input frequency from 300 to 3000 Hz has little effect on output. Switching in audio filter should attenuate all frequencies not in 700-Hz passband of filter. Gain is adjustable over wide range. Output will drive small loudspeaker of 4-16 ohms or headphones of 4-2000 ohms. Can also be used as test bench audio amplifier, intercom, or with code-practice oscillator. -J. Rusgrove, A General-Purpose Audio Amplifier, QST, Nov. 1976, p 32-34.



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