LED_PEAK_INDICATOR

Published:2009/7/16 4:53:00 Author:Jessie | From:SeekIC

The voltage divider consisting of resistor R6 and 2.5-V precision voltage reference IC2 forms a precision voltage reference whose voltage is divided in half at the junction of resistors R7 and R8.This places a reference voltage of 1.25V at the comparator noninverting input. Whenever the inverting input voltage exceeds the reference voltage, the output will be connected to ground internally, and LED1 will light. With the input of this circuit connected to the output of the averager circuit, the LED will flash on whenever the audio input exceeds the level set with gain potentiometer R2. Adjust R2 by applying a maximum level signal to the input of the averager, and then reduce the level slightly to allow for headroom. With the input level now set, adjust R2 until the peak LED just turns on.



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