Build a simple audio Milli volt meter circuit diagram. This Audio Milli Volt Meter Circuit
has a flat response from 8Hz to 50 kHz at -3 db on tbe 10-mV range. The
upper limit remains the same on tbe less sensitive ranges, but the
lower frequency limit covers under 1 Hz.
Simple Audio Milli Volt Meter Circuit Diagram
Sourced By : http://circuitsdiagram-lab.blogspot.com/2013/11/simple-audio-milli-volt-meter-circuit.html
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