OP27 Fixed Gain Transformerless Microphone Preamplifier


Posted on Feb 5, 2014

A simple but effective fixed gain transformerless microphonepreamplifier circuit diagramin the picure below. The circuit amplifies differential signals from low impedance microphones by 50 dB and has an input impedance of 2 kOhms. The OP27/37 operational amplifierhelps to preserve bandwith because of the high working gain of the circui


OP27 Fixed Gain Transformerless Microphone Preamplifier
Click here to download the full size of the above Circuit.

t. If you need the microphone is to be unplugged, a dummy resistor Rp may be necessary (source: analog. com)




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