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

[Happy Harry]

I suppose it would, but it would also put the meter
impedance across the capacitor as leakage. Measuring
both sides to ground would eliminate that possibility.

H^) harry


>From: Scott Gravenhorst <music.maker at gte.net>
>Reply-To: music.maker at gte.net
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] (Semi-OT) cap polarity in microphone
>Date: Mon, 18 Mar 2002 09:45:27
>
>I'm curious, why wouldn't measuring the DC across
>the cap terminals tell you?
>
>harrybissell at prodigy.net wrote:
> >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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>




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