microphone to record electromagnetic field of headphones

timdevine · 25th April 2011, 12:04 PM

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?

DF96 · 25th April 2011, 10:11 PM

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?

cbdb · 25th April 2011, 10:53 PM

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.

25th April 2011, 12:04 PM	#1
timdevine diyAudio Member Join Date: Apr 2011	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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25th April 2011, 10:11 PM	#2
DF96 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?

25th April 2011, 10:53 PM	#3
cbdb 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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