Electret Bias - diyAudio
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Old 8th May 2012, 12:21 AM   #1
diyAudio Member
Join Date: Mar 2012
Location: New York
Default Electret Bias

I disected a cheap desktop mic and am befuddled as to why these diodes are there, and what they do. The cap is SMD, and it appears the diodes are not zeners; they conduct with .5v drop using diode tester.
Gigaware 33-120 Mic Wiring Diagram_.JPG
The mic works well. I recorded a guitar piece through an onboard PC sound card and it was surprisingly good.

Any light that could be shed on this would be greatly appreciated.
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Old 8th May 2012, 09:46 AM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Switching between internal and external bias? If it is an electret it does not need any bias, so maybe there is a built-in FET preamp too?
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Old 8th May 2012, 10:56 AM   #3
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Join Date: Mar 2012
Location: New York
True. Internal JFET and cap. Some are available empty, but this one cannot be.
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