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Rotary switches?

Rotary switches?

1999-07-16 by Paul Schreiber

I will be the fisrt to agree there is a need in some cases for using a
rotary switch
on a VCO to rapidly "find" a certain pitch.

However, the reason I didn't do this initially is as follows:

a) couldn't locate a good, sealed switch! Really! 99% of switches are
"open-frame"
types a la' Minimoog. Can you say "oxidize"? Can you say "noisy, drifty".

b) you would need say 8-10 0.1% 20ppm resistors to solder which is another
$20

c) then you need 10-13 wires back to the pcb. Yuck! I would have to have a
custom
harness made. More $$$

BUT.... let's say there was this module that had 4 DC voltage outputs that
was 12-bit accurate. ZERO
drift. With 50 presets (each of 4 outputs can be set from say -4V to +4V)
that you can call up by
a pushbutton, or a trigger pulse (advance to next preset), etc etc
..........You then set the VCO's COARSE to 12 o'clock
(the zero volt spot) then using a mixer (or maybe the module has 1 input
that adds it to
the preset out voltage: ie your 1V/oct keyboard voltage is added to the
preset voltage) and poof!

You got 4ea "rotary switch" but it has 50 positions with memory! I am in the
$159 kit arena here.

Paul S.
always thinking ahead. You guys are spoiling my secret module plans :(

Re: Rotary switches?

1999-07-17 by improv@xxxx.xxxxxxxxxxxxxxxxx)

>From: "Paul Schreiber" <synth1@...>
>
>BUT.... let's say there was this module that had 4 DC voltage outputs that
>was 12-bit accurate. ZERO
>drift. With 50 presets (each of 4 outputs can be set from say -4V to +4V)
>that you can call up by
>a pushbutton, or a trigger pulse (advance to next preset), etc etc
>..........You then set the VCO's COARSE to 12 o'clock
>(the zero volt spot) then using a mixer (or maybe the module has 1 input
>that adds it to
>the preset out voltage: ie your 1V/oct keyboard voltage is added to the
>preset voltage) and poof!
>
>You got 4ea "rotary switch" but it has 50 positions with memory! I am in the
>$159 kit arena here.
>
>Paul S.
>always thinking ahead. You guys are spoiling my secret module plans :(
>
Now this sounds even cooler! I could imagine a couple hundred usages for a
module like this!

PS, just finished my 2nd 420. Wow, all I can say is that 2 420's add up to
way more than twice the coolness of 1. This is an incredible filter, the
more I play with it the more I like it.

________________________________________________________
Dave Trenkel : improv@... : www.peak.org/~improv/

"...there will come a day when you won't have to use
gasoline. You'd simply take a cassette and put it in
your car, let it run. You'd have to have the proper
type of music. Like you take two sticks, put 'em
together, make fire. You take some notes and rub 'em
together - dum, dum, dum, dum - fire, cosmic fire."
-Sun Ra
________________________________________________________