Yamaha CS80

Here is a quick recap of the VCO153 and GX1BPF:

VCO panel:
http://www.cs80.com/CSVCO153_FPD.pdf

VCO board (through hole prototype)
http://www.cs80.com/CSVCO_PCB.jpg

VCF panel:
http://www.cs80.com/GX1BPF_FPD.pdf

VCF board (through hole prototype)
http://www.cs80.com/GX1_BPF_PCB.jpg

One difference between the prototype and production models, aside
from lots of SMD parts, is the use of a small "jack board" soldered to
the PC pigtails of the Switchcraft 112PC jacks that connects to the main
board with a short ribbon cable. This allows me to keep everything in a
ground plane and remove a lot of tedious point to point wiring at the
same time.

Crow
/**/

Those looks really great! Any estimate on price yet?

Thanks!
----Jim

On Tue, Nov 15, 2011 at 12:25 AM, The Old Crow <oldcrow@...> wrote:

> **
>
>
> Here is a quick recap of the VCO153 and GX1BPF:
>
> VCO panel:
> http://www.cs80.com/CSVCO153_FPD.pdf
>
> VCO board (through hole prototype)
> http://www.cs80.com/CSVCO_PCB.jpg
>
> VCF panel:
> http://www.cs80.com/GX1BPF_FPD.pdf
>
> VCF board (through hole prototype)
> http://www.cs80.com/GX1_BPF_PCB.jpg
>
> One difference between the prototype and production models, aside
> from lots of SMD parts, is the use of a small "jack board" soldered to
> the PC pigtails of the Switchcraft 112PC jacks that connects to the main
> board with a short ribbon cable. This allows me to keep everything in a
> ground plane and remove a lot of tedious point to point wiring at the
> same time.
>
> Crow
> /**/
>
>
>


[Non-text portions of this message have been removed]

> The Old Crow <mailto:oldcrow@...>
> November 14, 2011 9:25 PM
> Here is a quick recap of the VCO153 and GX1BPF:
>
> VCO panel:
> http://www.cs80.com/CSVCO153_FPD.pdf
>
> VCO board (through hole prototype)
> http://www.cs80.com/CSVCO_PCB.jpg
>

Excellent! One thing (of course) - one of the coolest effects on a CS
is bending chords down to dc, which is possible since the VCOs are
linear, not exponential. I hope the FM input jack will allow this.
Maybe 0 volts is freq * 1 (no mod), +5v is freq * 2 (+1 octave) and -5v
is freq * 0. This would work like the ribbon on the CS80/60.

David


[Non-text portions of this message have been removed]

Currently the FM input is tied through an attenuator into the
exponential CV buss to provide exponential FM. This was done to
facilitate the use of the VCO in a modular system where most of the
control voltage sources are already linear. It is simple enough to bend
the frequency down to DC. In an expo VCO linear FM is typically used
for linear detune which the secret to obtaining what Jurgen (Haible)
describes as "living VCOs." I can add a switch-selectable linear/expo
FM option easily enough, though it adds like $15 to the end price.

Crow
/**/

On 11/15/2011 1:17 PM, David Rogoff wrote:
> Excellent! One thing (of course) - one of the coolest effects on a CS
> is bending chords down to dc, which is possible since the VCOs are
> linear, not exponential. I hope the FM input jack will allow this.
> Maybe 0 volts is freq * 1 (no mod), +5v is freq * 2 (+1 octave) and -5v
> is freq * 0. This would work like the ribbon on the CS80/60.
>
> David
>
>

David,
What do you mean by bending chords down to DC?
Doug

On Nov 15, 2011, at 3:10 PM, The Old Crow <oldcrow@...> wrote:

> Currently the FM input is tied through an attenuator into the
> exponential CV buss to provide exponential FM. This was done to
> facilitate the use of the VCO in a modular system where most of the
> control voltage sources are already linear. It is simple enough to bend
> the frequency down to DC. In an expo VCO linear FM is typically used
> for linear detune which the secret to obtaining what Jurgen (Haible)
> describes as "living VCOs." I can add a switch-selectable linear/expo
> FM option easily enough, though it adds like $15 to the end price.
>
> Crow
> /**/
>
> On 11/15/2011 1:17 PM, David Rogoff wrote:
> > Excellent! One thing (of course) - one of the coolest effects on a CS
> > is bending chords down to dc, which is possible since the VCOs are
> > linear, not exponential. I hope the FM input jack will allow this.
> > Maybe 0 volts is freq * 1 (no mod), +5v is freq * 2 (+1 octave) and -5v
> > is freq * 0. This would work like the ribbon on the CS80/60.
> >
> > David
> >
> >
>
>


[Non-text portions of this message have been removed]

Doug,

I wrote a long post on this a while back:

http://launch.groups.yahoo.com/group/yamahacs80/message/1435

David

> J. Douglas Rodriguez <mailto:floobygoop@...>
> November 15, 2011 4:50 PM
> David,
> What do you mean by bending chords down to DC?
> Doug

[Non-text portions of this message have been removed]

David,

What a wonderful post! Thank you! I learned a lot and it also explained
something I discovered when playing my CS50 for the first time, which as I
have mentioned in other posts, is only working on 1 voice card right now.
But by pushing the sustain slider on the left all the way up, I can make
it act like a monosynth. So while I wait for parts, that's what I've been
doing just to get myself familiar with it. When I assigned the
sub-oscillator to pitch the first time and heard the vibrato it produced, I
was dumbfounded. My Minimoog Voyager certainly doesn't sound like that.
My dotcom modular doesn't sound like that. My Andromeda doesn't sound
like that. I didn't understand why the vibrato was so natural, almost
organic sounding. Now I know! Thanks!

----Jim

On Wed, Nov 16, 2011 at 4:10 AM, David Rogoff <david@...> wrote:

> **
>
>
> Doug,
>
> I wrote a long post on this a while back:
>
> http://launch.groups.yahoo.com/group/yamahacs80/message/1435
>
> David
>
> > J. Douglas Rodriguez <mailto:floobygoop@...>
> > November 15, 2011 4:50 PM
>
> > David,
> > What do you mean by bending chords down to DC?
> > Doug
>
> [Non-text portions of this message have been removed]
>
>
>


[Non-text portions of this message have been removed]

Hehe... David, I remember 'Alice'... listening to good ol' Arlo right now...;c)

They told me I could get anything I want...!!
TOM (in the VW microbus...!)

--- In yamahacs80@yahoogroups.com, David Rogoff <david@...> wrote:
>
> Doug,
>
> I wrote a long post on this a while back:
>
> http://launch.groups.yahoo.com/group/yamahacs80/message/1435
>
> David
>
> > J. Douglas Rodriguez <mailto:floobygoop@...>
> > November 15, 2011 4:50 PM
> > David,
> > What do you mean by bending chords down to DC?
> > Doug
>