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VOLUME_UNIT_DISPLAY_AND_ALARM

2016-12-10 02:58  
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VOLUME_UNIT_DISPLAY_AND_ALARM
This circuit uses two audio amplifiers, one for a microphone and one for a stereo input, to drive an LED bar-graph display, rather than a meter. When the input exceeds a certain level, an LED (#8 in this circuit) will light and also cause an alarm buzzer or some other signal to actuate. A switch is provided for source selection.