Step 3: Example

Position the mic over the EMF source you'd like to listen to [a PC is pretty interesting] and you'll hear the feedback change.

Check out the video for a live demo of what you can hear.
Flash Animation

[Sorry about how dark it is, light receptor on my camera's burned out].
Hmmmm good idea. Have to try it.
Hmm... I don't see how this picks up EMF :S Normally, EMF induces voltage within a coil, I suppose if its a dynamic mic? Cool thinking though :)
The sensor (in the suction cup unit) attached to the audio-amplifier is a small coil.
does the amp need a power source?
Nope, the one in the demo is battery powered.
Another readily available thing you can use > Just use a portable hand held radio or walk-man on AM tuned between stations or to a station. It will detect ANY Electromagnetic Anomaly>>>>
Just tried this out with my hand-crank emergency radio. Definitely picked up some interference when the antennae is pointed at an EMF source, but the mic makes it much clearer. When rested against the PC you can hear modulation from the HDD- with the radio, it was much more subtle.
we used to use those in the phone company, use a coil on the end of the cable and a signal generator to find metal on metal contact that shouldn't be there. Very good and simple.

About This Instructable


12 favorites


More by vigerpersinger: Rit Dye Keyboard Mod - Aftermath Rit Dye Keyboard Mod Apartment Buzzer- Automatic Entry with Elastix IVR
Tags: emf audio
Add instructable to: