I've now seen Scott's panel design, and it's got all the features I put
on my panel. I'll be ordering panels from Scott, because I like his
designs and they are so much less expensive than Front Panel Express.
About the Exponential CV input, I couldn't say if it's the equivalent of
the Rise/Fall CV inputs in exponential mode. But yes, it's full on.
With Scott's panel, the processor output has a normalized connection
into the Both CV input. I would put a wire between both of the jacks'
switch lugs. That way, if the processor out jack has a plug in it, it
will be disconnected from the Both CV input. That's how I'd want it to
work, so that it could be patched to the Exponential CV input,
automatically disconnecting from the Both CV input, if you follow that.
Plugging into the Both CV input also disconnects it from the Processor
out with this normalizing scheme.
About the AC out, it's got a capacitor in series that limits the low
frequency response. Very slow changes won't pass through. It's
probably good down to a few Hz, before falling off. This output is best
used for audio frequencies.
Richard
Guy wrote:
Show quoted textHide quoted text
> Hey Richard, thanks for replying !
>
> The funny thing is, just 5 minutes before I checked in here, I saw Scott's VCS design over at the MSP group...
>
> --- In cgs_synth@yahoogroups.com, Richard Brewster <pugix@...> wrote:
>
>> I haven't built a CGS 75 yet. I am waiting to see what the Bridechamber
>> MOTM format panel looks like first. And I'm waiting for the CGS-75 PCB
>> boards to become available from Ken Stone again. But I can give some
>> answers.
>>
>> The AC output is ground-centered - it has zero bias.
>>
>
> So it will indeed go from 0V to -2.5V before it starts Rising, and from -2.5V to 0V at the end of Fall ? That'll give for a rather different sound/waveshape than the other outputs...
>
>
>> The Rise/Fall CV pots are reversible attenuators, with the center
>> position being the minimal amount.
>>
>
> As I thought, yes. Very cool.
>
>
>
>> Exponential CV affects both rise and fall equally in an exponential
>> manner. If cycling, it works similar to a 1V/oct CV input on a VCO, but
>> not accurate to 1V/oct.
>>
>
> So, the Exp.CV In is in fact the same as the Both CV In (when responses are switched to exponential), but always "full on". Right ?
>
>
>> I designed a Front Panel Express panel for the CGS 75 Serge VCS. It's
>> available in this directory on Yahoo Groups:
>> <http://launch.groups.yahoo.com/group/ModularSynthPanels/files/Richard%20Brewster%20Designs/
>>
>>
> I'll fire up WIndows on my Mac, and have a look. Thanks !
>
>
>> On my panel design I put input and output jacks for the Processor, so
>> that it can be patched in wherever you want it. I think the best option
>> for hard-wiring it would be in front of the Both CV input.
>>
>
> Okay, that makes sense. I think I'll include the Processor too - it's too useful to leave it out.
>
>
> thanks again !
> _g
>
>
>
>> Richard Brewster
>> http://pugix.com
>>
>>
>> Guy wrote:
>>
>>> Started doing the panel for the VCS, and wanted to be sure about some things. Sorry if this has been asked before.
>>>
>>>
>>> - The output signals - is this correct :
>>>
>>> http://www.guyd2.com/stuff/VCS_signals.gif
>>>
>>> (not sure about the bias of AC Out)
>>>
>>>
>>> - Are the Rise/Fall CV input pots wired for both negative & positive CV amount ?
>>>
>>> - As far as I understand, the Exp. CV In (1V/Oct) does not affect the rate of Rise/Fall, but merely 'transposes' the signal ?
>>>
>>> - The optional Processor section is simply a unity gain amp with either inverted or non-inverted output, right ? How can this be hard-wired to the VCS in- or outs for most effectiveness, ie. how can it be most useful when I don't bring it out to the frontpanel ?
>>>
>>>
>>> thanks,
>>> _g
>>>
>>>
>>>
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>> The CGS Modular Synth home page: http://www.cgs.synth.net/
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
