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Old 25th April 2011, 12:04 PM   #1
diyAudio Member
Join Date: Apr 2011
Default microphone to record electromagnetic field of headphones

Hey all,

I want to record the electromagnetic field of headphones from a distance. I figure something like a guitar pickup would work? Are there any such microphones?

Any thoughts?
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Old 25th April 2011, 10:11 PM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
A microphone picks up sound, and turns it into electricity. You want to pick up EM (presumably the magnetic field?) so you want an inductor. Try a 5mH RF choke?
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Old 25th April 2011, 10:53 PM   #3
cbdb is offline cbdb  Canada
diyAudio Member
Join Date: Oct 2008
Location: Vancouver
Eaves dropping? The field will be very small at a "distance" (more than a meter or 2). Just tried my medium sized over the ears headphones on loud right next to my bass guitar pickups (an inductor). With my small amp turned up full I could just hear the music (nothing below 1khz). 3 inches away, I couldnt hear anything. So its possible but not easy.
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