Sensitive electromagnetic field sensor circuit diagram

This is a very sensitive electromagnetic field sensor that can sense electromagnetic fields, circuit diagram from 40Hz to 140Hz . The pick-up part comes in the form of a low-noise operational amplifier LF351 and related components. For the sensing area 1UH coil L1 and IC1 perform the necessary amplification. If the electromagnetic field picked up is in the audio frequency range, it can be heard through the head phone Z1.There are also arrangements for meters to accurately measure signal strength. Transistor Q1 performs additional amplification to pick up the signal to drive the circuit diagram .

Precautions

This circuit can be assembled on Vero board.

Use a 9V PP3 battery to power the circuit.

Must be installed in IC1 holder.

Z1 can be an ordinary Walkman headset.

Switch S1 ON/OFF switch.

All electrolytic capacitors must be rated at least 10V.