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Headphone Anomaly

P

PerXes

n00b
Joined
Apr 14, 2004
Messages
23
If you've heard this one, skip this part. Try this: plug your headphones into the microphone port of your soundcard. Open up a recording app, and speak into the earphones. You'll notice that the application is picking up your voice(or you SHOULD, anyway).

Does anyone know what, how, why this is going on? I took apart an old pair of headphones I had, and I tried to trace all the wires, and I couldn't find anything that looked like it would be a microphone in the earphone. Any idea what's going on here?
 
didnt do anything for me when i plugged my sennheiser hd497's into the microphone slot on my audigy 2. wasnt surprised.
 
You put the input for the headphones into the microphone port? Did you try both earcups?
 
The pin-out for the MIC jack on most sound cards is:
Tip = audio input
Ring= +5 to +12 volts DC
Sleeve = ground

When you plug your headphones into the Mic port you are applying DC voltage across the right hand driver which will fry it in no time flat.
(it takes less then a volt to fry low impedance headphones)

You are right about thing.
Speakers and headphone transducers work on the same principle as dynamic microphones except it works the other way around.
(you are not using voltage to move the diaphragm you are moving the diaphragm and creating voltage)
 
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