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Just use my subwoofer. It buzzes whenever anything electronic gets near it.

Alternatively, get an AM radio, and tune it to a space where no-one is broadcasting. Most devices emit a load of electronic noise. I have found that it can detect most electrical devices, though it often requires the device to be active - something like a light will not be detected (you might hear an AC hum but not much else), whereas something like a computer will because there is a constant amount of 'change' in the noise emitted. A device can locate another device or parts or items if the item to be located has a RF transmitter embedded into the construction. The finder device must be a narrow band receiver to detect that particular signature of the transmitting device.

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Q: How to make an electronic device which will find any electronic device around it.?
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