This is an audio meter, a kind of decibel simpler, used to measure the sound directly in the circuit or a sound output device. It is very simple, using only two transistors BC107, potentiometer VR2 adjusts the input level and the level of VR1 VU. This meter audio should only be used for bench testing and should not be used for calibration.
Simple Audio Meter Circuit Diagram
Simple Audio Meter Circuit Diagram
Simple Audio Meter Circuit Diagram
Simple Audio Meter Circuit Diagram
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