[sdiy] clickless muting

Neil Johnson neil.johnson97 at ntlworld.com
Mon Oct 29 17:42:00 CET 2012


Hi David,

> Something interesting, though.  I made some (rough) measurements with my
> oscilloscope and my 2164 VCA yesterday, and using the 2164 as a switch gives
> at least 80dB of "off-ness" (it gives 100dB according to the datasheet, but
> I couldn't tell beyond 80dB because this was below the noise floor of my
> signal -- i.e., it disappeared completely within the noise band on the scope
> at about 3mVpp).

If you're working at those sorts of signal levels you really need to
think about your test equipment.

> I'm thinking that perhaps just one JFET to shunt the current to
> ground prior to the 2164, along with a large positive voltage to the 2164,
> would be the best option.

Sounds like you have a solution.

Neil
-- 
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Homepage: http://www.njohnson.co.uk



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