Noise Limiter

The noise limiter circuit is easy to build, in collaboration with 4pin or 8pin BA741 very attentive, and uses a balanced diet. When the audio input level is between the output of 20mV and a constant signal is 20V 25mV. Audio limiters can be used in a scheme issuer or in any circuit you need a constant level.

components
R1 = 100K
R2 = 1K
R3 = 1M
R4 = 68K
R5 = 10K
C1 = 10uF
C2 = 680nF
T1 = BFW11
T2 = BC173C
IC = BA741