Cgs synth

Look carefully and you will see two different frequency modulation
inputs. CV1, CV2, TUNE, and the 1V/oct inputs are the exponential
inputs. These are the normal ones you use to make the VCO follow a
keyboard, etc. These are DC coupled (no capacitor). It is the LINEAR
FM inputs that have the AC and DC on them. Linear FM typically uses the
AC coupling capacitor to avoid weird offsets. You usually put an audio
frequency signal here for special modulation effects. If you have
limited panel space you may want to use only the AC coupled linear FM
input. My CGS VCO has a 1V/Oct FM input, plus a general FM input jack
with attenuator. I have two switches following that: one to route to
the exponential vs the linear input, and one for AC/DC that just shorts
the capacitor for DC coupling.

If building this VCO you should compare the ASM-1 VCO, which is
similar. Do a web search an you find lot of information and schematics
for the ASM-1.

-Richard Brewster

Gerald Stevens wrote:

>Cole,
> The outputs and inputs are listed in the PCB connections table on the VCO
>webpage. I'm about to start drilling out a panel for the board, which I
>stuffed last weekend. What I want to know is, why two FM inputs (DC and AC)?
>What does a D/C component do to FM, offset the pitch? Can someone give me an
>example of the use of a D/C coupled FM input?
> thanks,
> -gerald
> On 10/12/05, brownchonald <chonald@...> wrote:
>
>
>>What are my options for the outputs and inputs on the CGS VCO?
>>
>>I'm wanting to order two PCBs. But am not sure what to make the front
>>panel look like.
>>
>>Will anyone help me out?
>>
>>Cole
>>
>>
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>>The CGS Modular Synth home page: http://www.cgs.synth.net/
>>
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