Cgs synth

> Quite a bit of modules on CGS are noted as "will run on +12 volts". My main focus though is on the Tube VCA/Timbral Gate and wonder if I would be able to get it to run on my eurorack system (+/-12v)? What would I have to do in order for me to achieve this?
> Thanks!

--- In cgs_synth@yahoogroups.com, Ove Ridé <nitro2k01@...> wrote:
>
> On 8 January 2011 20:06, analougecircuits1 <analougecircuits1@...> wrote:
> > Quite a bit of modules on CGS are noted as "will run on +12 volts". My main focus though is on the Tube VCA/Timbral Gate and wonder if I would be able to get it to run on my eurorack system (+/-12v)? What would I have to do in order for me to achieve this?
> > Thanks!
>
> Are there actually any references to "will run on +12 volts" anywhere
> on the site? All I could find was "Will run on +/- 12 volts or +/-15
> volts" and "Will run on +/- 12 volts. +/-15 volts has not been
> tested."
> +/-12V means that a module is using both the negative and the positive
> voltage rail for power. This is the most common scenario. Generally,
> something designed to run on just +12V can be used with a +/- 12 volts
> power supply simply by only connecting the positive power rail.
>
> If you look here, you'll see two things:
> <http://www.cgs.synth.net/modules/cgs65_vca.html>
>
> 1) "All this while running on a *standard synthesizer power supply*,
> with no extra heater supply required." which implies a +/-12V supply.
> 2) If you look at the photo at the top and the schematic, you'll
> notice that -VE is connected and actually goes somevhere.
>
> So, all is as it should be.
>
> --
> /Ove
>
> -----BEGIN 2ROT13 MESSAGE-----
> Blog: <http://blog.gg8.se/>
> Sätt på ett par flipflops, vippa på rumpan
> och gör det här till en minnesvärd sommar!
> -----END 2ROT13 MESSAGE-----
>

On 9 January 2011 09:59, analougecircuits1 <analougecircuits1@...> wrote:
>
>
>
> Thank you for such a quick reply. Sorry about the "+12 volts" I thought the negative was implied, I am a lazy typer and I apologize for that. What I was mainly worrying about is since the device is meant to run on +/-15, perhaps it wont get enough power on a eurorack to have the desired distortion without perhaps some modification.
> I defiantly have more courage now to attempt this project.
>
> --- In cgs_synth@yahoogroups.com, Ove Ridé <nitro2k01@...> wrote:
>
> >
> > On 8 January 2011 20:06, analougecircuits1 <analougecircuits1@...> wrote:
> > > Quite a bit of modules on CGS are noted as "will run on +12 volts". My main focus though is on the Tube VCA/Timbral Gate and wonder if I would be able to get it to run on my eurorack system (+/-12v)? What would I have to do in order for me to achieve this?
> > > Thanks!
> >
> > Are there actually any references to "will run on +12 volts" anywhere
> > on the site? All I could find was "Will run on +/- 12 volts or +/-15
> > volts" and "Will run on +/- 12 volts. +/-15 volts has not been
> > tested."
> > +/-12V means that a module is using both the negative and the positive
> > voltage rail for power. This is the most common scenario. Generally,
> > something designed to run on just +12V can be used with a +/- 12 volts
> > power supply simply by only connecting the positive power rail.
> >
> > If you look here, you'll see two things:
> > <http://www.cgs.synth.net/modules/cgs65_vca.html>
> >
> > 1) "All this while running on a *standard synthesizer power supply*,
> > with no extra heater supply required." which implies a +/-12V supply.
> > 2) If you look at the photo at the top and the schematic, you'll
> > notice that -VE is connected and actually goes somevhere.
> >
> > So, all is as it should be.
> >
> > --
> > /Ove
> >
> > -----BEGIN 2ROT13 MESSAGE-----
> > Blog: <http://blog.gg8.se/>
> > Sätt på ett par flipflops, vippa på rumpan
> > och gör det här till en minnesvärd sommar!
> > -----END 2ROT13 MESSAGE-----
> >
>
>


--
/Ove

-----BEGIN 2ROT13 MESSAGE-----
Blog: <http://blog.gg8.se/>
Sätt på ett par flipflops, vippa på rumpan
och gör det här till en minnesvärd sommar!
-----END 2ROT13 MESSAGE-----

--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> I connected mine up to +/-12 volts today, without midification, though I do
> have an adjustable plate currrent on my module. I was using line level
> signals. It worked without issue.
> One fellow who was using hotter signals was finding some distortion that
> differed from when running on +/-15 volts.
>
> Try reducing the filament current limiting resistors from 1k5 to 1k2, and
> putting a 20k pot in series with the 8k2 plate resistor.
>
> Ken
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>

--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
>
> >My main worry is:
> >Might this be a op amp problem?
>
> Possibly. Is the signal louder at pin 5 of the opamp? If it is, you
> definitely have a problem. You should be able to increase the gain of the
> opamp by putting a lower value resistor in the Gain Adust reisitpr position.
> (See the schematic)
>
> >Can using low quality capacitors be a problem as well?
> Probably not. They would have to be attrocious to the point of being faulty.
>
> Ken
>
> >
> >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
> >>
> >> I connected mine up to +/-12 volts today, without midification, though I do
> >> have an adjustable plate currrent on my module. I was using line level
> >> signals. It worked without issue.
> >> One fellow who was using hotter signals was finding some distortion that
> >> differed from when running on +/-15 volts.
> >>
> >> Try reducing the filament current limiting resistors from 1k5 to 1k2, and
> >> putting a 20k pot in series with the 8k2 plate resistor.
> >>
> >> Ken
> >> _______________________________________________________________________
> >> Ken Stone sasami@ otherunicorn@
> >> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> >> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
> >>
> >
> >
> >
> >
> >------------------------------------
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >Yahoo! Groups Links
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>