Cgs synth

Here is a schematic for the CV inputs that some of us have used:

http://www.pugix.com/bottom-cabinet-lower.htm#synthacon
http://www.pugix.com/images/steinervcf-mod-mine.gif

Richard Brewster

Ryan Williams wrote:

>I expect you are talking about the 'All Input'? that input is actually just
>connecting a single input to the lowpass, highpass, and bandpass inputs. the
>filter itself acts as a sort of mixer for those signal. just connect that
>jack to each of the other jacks, normally closed contacts.
>
>the resonance can not be CV controlled without a fairly major modification
>to the circuit. I don't recall seeing any good design for this yet.
>
>to add a frequency cv amount pot, it would connect just like the frequency
>pot except the +15 is replaced with the CV input jack. on the wiring diagram
>you linked, connect the pot like this: connect pin 1 of the pot to ground,
>pin 2 of the pot to the point on the PCB where the frequency jack current
>connects, connect pin3 of the pot the jack connection that is currently used
>(TP).
>
>that will give you a resistve voltage divider. you can use a 100k or
>somewhat smaller pot if you like (not really critical).
>
>On 5/8/06, Rune Sagevik <rsagevik@...> wrote:
>
>
>
>>I`ve seen several solutions around the web regarding this filter, and
>>decided to try a version with built in "input mixer" and CV control
>>for both freq. and res. (as seen here http://guitarfool.com/modules/
>>images/Synthacon01.jpg)
>>but.. when reading Ken`s web pages and looking at this http://www.cgs
>>synth.net/modules/pic/wire_cgs35_syntha_vcf_r1.gif
>>as far as I can see here there are only one CV input pluss two knobs,
>>one for freq. and one for res.
>>So what I was wondering was.. where would I add pots. to control/mix
>>the input signals, and what type of pots would I need to use?
>>and the same with the CV. Where and how would I add an "amount knob"
>>to control the amount of the CVin being used to control the freq.
>>And also.. how to do the same to the Resonance? add a Cv jack and an
>>amount knob.
>>
>>thanks in advance.
>>Rune
>>
>>
>>