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DIY: listening to electromagnetic fields

Submitted by on November 2, 2009 – 8:49 am 3 Comments

It’s amazing how many electromagnetic fields are all around us. The cool part about it is that it’s very easy to be able to hear the fields that are in the audible range. Here’s a quick and easy DIY project that will help you do just that.

All you need is the electronic guts of an old cassettte walkman. You can pick these up at thrift stores for next to nothing (hey, who uses tapes anymore?). Rip out everything except the circuit board, the tape head, power source and audio connector. It’s best to use the batteries if you can because power adapters have their own EM field.

That’s it.. you’re done. Just take your device, point it at anything that would have an EM field (try close to parts of your laptop – laptops have a huge amount of different EM fields coming from them), and plug the audio output into your computer or powered speakers. You can record the output with any old audio recording software (windows has a voice recorder built in.)

So go ahead and discover all the fluctuating electromagnetic fields that are all over the place!

Here’s a video of the boys at retrointerfacing using such a device to listen to their laptop.

Some of the EM fields I have found are really strange sounding. You can even find out if any given wire is ‘live’ with AC current using this method.

SynthGear Tags

  • homemade listening device
  • magnetic microphone record field


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