[sdiy] digitally switching cv and audio lines

[jhaible]

I just looked at the data sheet for this.

I don't understand how this will work as a signal and CD routing
matrix for a synth.

I'm familiar with the EMS system, where pins with built-in resistors
will
(1) mix signals from seperate sources, and
(2) isolate seperate sources which share one, but not all, destinations.

Does this really work with that chip? The 200R on-resitance
looks awfully low for that purpose. (For comparison: EMS uses
several kilo-ohms.)

Are you going to scale down your CVs and signals so much that you
can mix with 200R, or what is the trick ?

One "critical" example would be:
(with xi = sources, and yi = destinations)

You want to make these 4 connections:
x1 -> y1
x2 -> y1
x1 -> y2
x2 -> y3

How will you avoid to also get the (unwanted) connections
x1 -> y3  and
x2 -> y2

???

JH.



-----Ursprüngliche Nachricht-----
Von: ASSI <Stromeko at compuserve.de>
An: synth diy <synth-diy at dropmix.xs4all.nl>
Gesendet: Sonntag, 28. September 2003 17:33
Betreff: Re: [sdiy] digitally switching cv and audio lines


> Hi folks,
>
> I've uploaded an update to my analog switch matrix project at
>
> http://homepages.compuserve.de/Stromeko#Matrix32x32
>
> I know it's going slow, but my schedule at work doesn't permit to put
> more time into it at the moment...
>
>
> Achim.
>
> -- +<[_Q+_Matrix-12_WAVE#46_microQkb/Omega_XTk/30_sonic_heaven_]>+ --
>
> Factory and User Sound Singles for Waldorf Q, microQ and rackAttack:
> http://homepages.compuserve.de/Stromeko#WaldorfSounds
>
>
>