Archive of the former Yahoo!Groups mailing list: MOTM

DO IT!!!!!

Paul Schreiber wrote:

> From: "Paul Schreiber" <synth1@...>
>
> While attending a National Semi seminar today (Bob Pease was a riot! Had him
> autograph his book)
> I doodled out a mixer. Comments, please.
>
> a) It's either 6:1 or 2 seperate 3:1 AC/DC mixers
> b) in 6:1 mode, you have 2 outputs
> c) in 3:1 mode, each mixer has an output
> d) toggle switch that Larry torques to 400ft-lb selects the mode
>
> now tricky stuff
>
> e) there is only 1 MASTER level out. It is a dual pot. So, in 3:1 mode the
> MASTER effects BOTH mixers
> the same.
>
> Actually, this can be sort of cool. You can still individually set the
> levels (say Mixer #1 is "left" and Mixer #2 is "right")
> and the with the MASTER fade them both in and out at once.
>
> f) uses the pots found on the ADSR. I PROMISE to make the holes bigger this
> time!!
> g) uses OP275s as the summing amps, but a tricky OP-97 as a DC servo amp to
> reduce the output
> offset voltage to 25uV. This is so you can sum CV and audio with it and get
> ZERO drift. As far as I know,
> this has NEVER been done in any synth. Serge included.
>
> I estimate the cost to be $130 because of the $$$ of the pots, it has 8
> jacks, and the OP-97s ain't cheap.
>
> Well??!?!?
>
> Paul S.
>
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