This is a schematic design for the sensor to the electromagnetic field. This circuit is very simple, which is based or built by the IC 741. This IC is the op amp. The circuits that can detect even hidden field wrings. This is the schematic figures. 1mH inductor is used for electric field sensing. Small electric field will cause the voltage on the inductor and the induced voltage sensor is amplified by op amp. Headphones are connected to the output of op amp audio will an indication of electrical field. For example, the electric field around the main transformer can be heard as 50 Hz hum. The circuit figure is show in below.
In the circuit diagram is that POT can be used to adjust the gain of the amplifier. By maintaining the sensor inductor close to the phone, you can even hear the phone conversation. All electrolytic capacitors should be rated at least 15V. The switch S1 can be a slide type ON / OFF switch. R4 POT that can be used to adjust the gain. Better to have a radial type inductor.
In the circuit diagram is that POT can be used to adjust the gain of the amplifier. By maintaining the sensor inductor close to the phone, you can even hear the phone conversation. All electrolytic capacitors should be rated at least 15V. The switch S1 can be a slide type ON / OFF switch. R4 POT that can be used to adjust the gain. Better to have a radial type inductor.
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