[sdiy] clickless muting

Barry Klein barryklein at cox.net
Mon Oct 29 06:02:17 CET 2012


It was not really a  transmission gate - it was half of a fet pair on the
chip.

-----Original Message-----
From: David G Dixon [mailto:dixon at mail.ubc.ca] 
Sent: Sunday, October 28, 2012 21:23
To: 'Barry Klein'; 'synthdiy diy'
Subject: RE: [sdiy] clickless muting

> What I remember about this design was that the gates took advantage of 
> the virtual ground of the negative input of an opamp as well as 
> another gate being in the op amp feedback loop.  It thus eliminated 
> the usual signal distortion as well as supported signals up to the 
> supply rails - which a CD series chip would normally not do.

Hmmm.  Interesting.  However, if the transmission gate is in the feedback
loop, then when this if off, the opamp hits the rail.  Are you sure it
wasn't at the input?

> Where are the "figures" you refer to?

Oops!  I forgot to type the source: Douglas Self's "Small Signal Audio
Design".




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