This is an useful circuit.It used to monitor audio power delivered to loudspeakers like a VU meter. No power supply - no setup required .source
Audio Indicator
Six-LED Bar Power Indicator
Catagory : Audio Indicator, LED circuits
Three-Level Audio Power Indicator
Catagory : Audio Indicator, LED circuits
Three-Level Audio Power Indicator.Battery-operated 3 LED display.Simply connect it to loudspeaker output.source
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