NOISE_ACTUATED_AVC

Published:2009/7/23 22:50:00 Author:Jessie | From:SeekIC

Emitter current of 2N43A controlled low-level audio amplifier stage Q3 is regulated indirectly by sound pressure level of ambient noise. With no noise, gain of controlled amplifier is prevented front going to zero by applying quiescent conduction bias through R1 to gain-control stage Q2.-D. C. Gibson, Helmet Transceiver for Flight Deck Communications, Electronics, 33:39, p 56-60.



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