[sdiy] digitally switching cv and audio lines

[ASSI]

On Sunday 28 September 2003 21:32, jhaible wrote:
> I don't understand how this will work as a signal and CD routing
> matrix for a synth.

This is explained in a bit more detail in the description file for the 
project (it's HTML, you don't need Eagle for that).

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

The trick is to use part of the matrix for splitting signals in voltage 
mode and another part of the matrix for summing currents into a virtual 
ground. This chip is far from ideal for CV application (I'd really like 
to ask whoever did the product definition what they were thinking). You 
never get to use even half of the available switches; but even then, at 
the price, port density and with the headroom available from the high 
analog supply voltages I haven't found anything else that might be 
suitable or come close.

My original idea was to use it just as an electronic patch panel to 
route and possibly split all the sources (which I'll probably never use 
all at the same time) into the limited set of mixer channels. For this 
the thing should work quite nicely. That's also what I'll try to 
actually implement first when/if I find the time.


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