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

[Happy Harry]

This is a job for a non-polar electrolytic (imho)   ;^P

H^) harry


>From: Ingo Debus <debus at cityweb.de>
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] (Semi-OT) cap polarity in microphone
>Date: Tue, 19 Mar 2002 14:30:26 +0100
>
>
>
>Happy Harry 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...
>
>This depends on where the mic is plugged in. The plus side of the cap is
>just connected to the output of the mic.
>
>Plugged into a normal mic input, the cap is reverse biased with 1.5
>volts. When plugged into a "plug-in-power" input with a voltage higher
>than 1,5 volts, it's forward biased. Perhaps they thought, better have
>it reverse biased with 1,5 volts (normal input) than reverse biased with
>an unknown voltage (plug-in-power). The two devices with plug-in-power
>inputs I own (a camcorder and a MD recorder) have 2,5 volts. Are there
>inputs with higher voltage?
>
>Ingo
>
>




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