Electromagnetic
field sensor circuit
This is a very
simple circuit that can be used to sense electromagnetic radiations.
The circuit can even detect hidden wrings. A 1mH inductor is used for
sensing the electric field. The electric field will induce a small
voltage in the sensor inductor and this induced voltage is amplified
by the op-amp. The headphone connect at the output of the op-amp will
give an audio indication of the electric field. For example, the
electric field around a mains transformer can be heard as a 50 Hz
hum. The POT R4 can be used to adjust the gain of the amplifier. By
keeping the sensor inductor near to a telephone line, you can even
hear the telephone conversations.
Notes.
- Assemble the circuit on a general purpose PCB.
- The circuit can be powered from a 9V PP3 battery.
- It is better to have a radial type inductor for L1.
- The POT R4 can be used to adjust the gain.
- The switch S1 can be a slide type ON/OFF switch.
- The IC1 must be mounted on a holder.
- All electrolytic capacitors must be rated at least 15V.
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