Odp: [sdiy] Interesting matrix

[Roman]

maybe they used resistors at inputs, and matrix IC outputs are
at opamp suming nodes?

Roman

----- Original Message ----- 
From: Paul Maddox <P.Maddox at signal.qinetiq.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, October 22, 2002 10:38 AM
Subject: [sdiy] Interesting matrix


> Dear all,
> 
>   Anyone seen this?
> http://www.users.globalnet.co.uk/~concuss/
> 
>   Look just below the "red square" synth, It claims to be an analogue patch
> matrix.
> Having looked at this myself several times Im intrigued to know which matrix
> chip has been used.
> Remember the discussions about Ron and such for the matrix 'switchs', most
> of these are 100ohms or less (more commonly 50ohms) and might present
> problems when trying to sum several CVs to one output, so did this guy crack
> it?
> 
> Paul (tempted to buy one to play with)
>