From: John Woodgate
Subject: Re: Help needed with audio mute circuit
Date: Fri, 20 Sep 2002 21:56:03 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Fri, 20 Sep 2002 21:01:26 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that A.Iakovlev
wrote (in <3D8B820C.FF17987D@worldonline.fr>) about 'Help needed with
audio mute circuit', on Fri, 20 Sep 2002:
>Does 'cooking' refer to the TO-18 and the like packages,
> or something else? The
>datasheet of the 2SD2144 specifies the Ron in the setup we are talking about;
>than 60dB attenuation is obtainable. I wonder if there is something special
>this kind of bjts...
Only a very low Vcesat, which is more or less the same as a low Ron. If
you feel you need the Ron spec to rely on, us the 2SD2144. You might
also experiment with inverted operation, which gives even lower Vcesat;
collector to ground and emitter to signal, but you will need more base
current to mute.
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!