AGC circuit = Automatic gain control

Published:2012/10/11 2:22:00 Author:muriel | Keyword: AGC circuit | From:SeekIC

The automatic gain control circuit AGC provides a signal with less harmonics and additional amplification, between certain limits.As a result, it eliminates those intensity differences, annoying, and of speech music, which sometimes appear on radio and television.Field effect transistors T1 is used as a variable resistance. It’s value can vary from infinity to about 150Ω. It is in parallel with R3 and R4 together with, inducing the amplification of A1. Without FET, gainof A1 is about 20 dB. AGC Automatic Gain Control circuit diagram Amplification of A1 and A2 compensates damper losses: total agc circuit gain, with T1 blocked is 0 dB. Signals with a level lower than that set by P1 are amplified by a factor of maximum of 6.9 (= 17 dB amplification). AGC components list semiconductors D1 = 1N4148T1 = BF245CIC1 = TL072IC2 = TI071 Automatic gain control PCB



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