[sdiy] (Semi-OT) cap polarity in microphone

[Happy Harry]

If the bias on the preamp side of the cap is higher than
the mic bias voltage... its correct.

If not it is an assembly error. Measure the DC on both sides
with respect to ground, and decide...

H^) harry


>From: Ingo Debus <debus at cityweb.de>
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] (Semi-OT) cap polarity in microphone
>Date: Mon, 18 Mar 2002 11:02:21 +0100
>
>Hi,
>
>out of curiousity I had a look into my cheap (about $50) stereo electret
>condensor mic. Not much in there, two capsules with two wires each,
>powered via 6.8k resistors from a 1.5V battery, and two 10uF 25V
>electrolytic caps in the signal paths. But the funny thing is, minus of
>the caps is connected to the capsule side, where the plus of the power
>supply is connected (through the 6.8k resistor). That's backwards,
>correct? Is there a specific reason for that, or is this an assembly error?
>
>Ingo
>




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