Audio Level Meter by BC108

Advertisements

Audio levels can be monitored using a small panel meter with this circuit built from discrete components

The circuit has a flat frequency response from about 20Hz to well over 50Khz. Input sensitivity is 100mV for a full scale deflection on a 100uA meter. Built on two common emitter amplifiers, the first stage has a preset resistor which may be adjusted for a FSD. The last stage is biased to operate at roughly half the supply voltage for maximum ac voltage swing. Audio frequencies are passed through the 10u dc blocking capacitor and the full wave bridge rectifier converts the signal to a varying dc voltage.

Read More Source: Circuit : Andy Collinson
http://www.mitedu.freeserve.co.uk/Circuits/Audio/audiolevelmeter.htm
Thank you.

This entry was posted on Friday, April 11th, 2008 at 3:21 pm and is filed under Audio - Alarm, meter. You can follow any responses to this entry through the RSS 2.0 feed.