[sdiy] adding multiple signal/cv inputs: SSM2044

[harrybissell at wowway.com]

You could duplicate C10 and R13 as many times as you need for audio inputs..
but the 4.7K is a little low in impedance for a pot on each one (you'd need
like a 1K pot... could probably get as high as 10K with the taper being funny).

You could build a summer before this and couple via the normal input as you
suggested.

H^) harry



On Wed, 15 Oct 2008 14:38:28 +0000, Dan Snazelle wrote
> using this schematic
> 
> http://modular.fonik.de/pdf/SSM2044small.pdf
> 
> i would like to be able to add a total of 4 audio ins (each with a 
> pot to control its volume) and 4 cv ins.
> 
> i was under the impression i could just add more 100k resistors to 
> opamp U2 for more CV ins. as far as the extra audio ins...could i 
> just put an opamp summer (with a 100k pot for each input instead of 
> the fixed 100k resistor) before pin the 10uf cap on pin 1 of the ssm2044??
> 
> any help would be greatly appreciated.
> 
> in a sense i am basically trying to make the summer before the 
> filter my "audio mixer" and the filter is the last state in the 
> hardwired synth before the vca
> 
> does that makes sense?
> 
> or would it be best just to build an opamp mixer as a seperate unit 
> and plug that into the audio input he already has in place?
> 
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Harry Bissell & Nora Abdullah 4eva