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).
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
>
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