Amplifier input signal overdrive auto-protection

Posted on Dec 29, 2012

That circuit protects the overdriven signals going into an amplifier. Instead of a zener diode we use a transistor. That way we ensure that the above the ordinary input voltages ( 1 volt r.m.s.) can be acheaved without distortion. Also the use of a transistor limits the number of components used in this schematic.

Amplifier input signal overdrive auto-protection - image 1
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You don't need any potentiometers or voltage dividers. The total distortion at the output until 700mV r.m.s. is 0%. Above that until 1V r.m.s. the total harmonic distortion can be 0.02%.

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