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)

Leave Comment

characters left:

New Circuits



Popular Circuits

Simple Microphone Mixer
AC Millivoltmeter Adapter
Music to light modulator circuit
pic16f84a relay control board
Switching Power Supply
Flyback Converters for Dummies
Small TV terminal with ATmega8 microcontroller