IEPE Amplifier with Headphone Output

The 1-channel IEPE amplifier AV14S is a small accumulator-driven instrument, which has been constructed mainly to monitor acoustic or vibration signals. It has 1 measuring channel for an IEPE microphone or IEPE accelerometer. A headphone output is built in for monitoring purposes. The loudness of the headphone can be adjusted by the potentiometer on the right side of the instrument.

At the output socket you get a voltage proportional to the acceleration or sound pressure independent of the amplification of the headphone amplifier. So the instrument can be used as a front end for analyzers or similar instruments.