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Subject: Re: Help needed with audio mute circuit
Date: Fri, 20 Sep 2002 08:24:16 +0200
Organization: Wanadoo, l'internet avec France Telecom
NNTP-Posting-Date: 20 Sep 2002 06:24:20 GMT
X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.4.19 i686)
John Woodgate wrote:
> I read in sci.electronics.design that LY wrote (in <9m7i9.1785$Y
> E2.email@example.com>) about 'Help needed with audio
> mute circuit', on Wed, 18 Sep 2002:
> >BJTs on the other hand are less a cent a piece.....
> >There has to be a way.... isn't there?
> Yes. Several European audio products simply connect a small-signal
> transistor across the signal, downstream of a 1 k resistor if the signal
> source is low-impedance, and feed a few hundred microamps into the base
> to turn the audio off. There is very little non-linearity introduced
> when the transistor is 'off'.
> Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
> Interested in professional sound reinforcement and distribution? Then go to
> PLEASE do NOT copy news posts to me by E-MAIL!
I have seen 2SD2144s used in that way. Is the choice of the transistor
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