Audio Peak Indicator

A simple circuit peak indicator of tops of musical signal. Each time where the level of signal exceeds the level + 4dB, turns on led D1. It is useful in each channel of console of sound, in final amplifiers or in that other application,to we needed. With the prices of circuit, the indicate begins with levels above + 4 dB (1.25V rms). For adaptation in different levels of signal, we can use a trimmer, before capacitor C1. T? circuit can collaborate excellently with the circuit, Mic/Line Balance., after C11​

R1= 10Kohm C1= 47uF 25V
R2= 1.2Kohm C2= 2.2uF 25V
R3= 220Kohm Q1-2= BC550C
R4-5= 4.7Kohm D1= LED RED​

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