From: John Woodgate
Subject: Re: Help needed with audio mute circuit
Date: Fri, 20 Sep 2002 08:14:16 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 20 Sep 2002 07:56:17 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that A.Iakovlev
wrote (in <3D8ABF10.75DC8400@worldonline.fr>) about 'Help needed with
audio mute circuit', on Fri, 20 Sep 2002:
>John Woodgate wrote:
>> I read in sci.electronics.design that LY wrote (in <9m7i9.1785$Y
>> E2.firstname.lastname@example.org>) 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
In Europe, the 'cooking' audio device that started as BC108 and is now
available in many encapsulations is normally used.
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!