[sdiy] Vactrols & Lopass Gates

[Peter Grenader]

Mark -

Have a look at the Buchla's schematic B2420B.  It's the one from the CBS
system.  Note the switch symbol - two contacts -- dual switch.  The top one
shorts out the filter, the bottom one kills the feedback.  There is no
connection shown for a third center position.  The off (center) keeps the
filter going but kills the feedback thru the FET.  There is a marketable
sonic difference between the center and down (LP) positions.

Try it with a standard double pole triple throw.


mark verbos wrote:

> The Buchla 292B uses a C&K 7211 On-ON-ON switch. I am sorry, but it's a
> fact. I have built them all as well.