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From: "Phil Allison"
Subject: Re: Need 2SC3326 Transistor for an Audio Mute circuit
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Sat, 21 Dec 2002 17:10:05 +1100
NNTP-Posting-Date: Sat, 21 Dec 2002 16:58:16 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Steven" wrote in message
> "Teece" firstname.lastname@example.org
> wrote in message news:XxycnUUZu6EoUJ6jXTWcqQ@giganews.com...
> > Hi,
> > I am building an audio mute circuit which effectively short circuits the
> audio to
> > ground. It works pretty well except that there is distortion in the
> > the mute circuit is not active. I built it with a garden variety 3904 as
> the switch
> > and I suspect that when this part is turned off there is enough junction
> > capacitance in the collector to cause distortion at audio frequencies. I
> > seen mute circuits with the 2SC3326 as the switch but I can not find
> > available anywhere. What other parts are there that would do the job? I
> > have +3.3V DC available so I might have trouble turning a FET on and
> No you won't. A BSS138 has an Rds(on) < 2 ohm @ Vgs = 2.5V
** Two problems,
1. The figure you quote above is wrong - that graph is normalised.
2. There is an inbuilt drain source diode.
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