Cgs synth

I've uploaded the construction details for my altest two projects - a VCO,
and a drum simulator that does cymbals, snares, electronic drums etc.

Have fun!

Ken
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

where is it :-)


Jeff

--- In cgs_synth@yahoogroups.com, sasami@h... wrote:
> I've uploaded the construction details for my altest two projects -
a VCO,
> and a drum simulator that does cymbals, snares, electronic drums
etc.
>
> Have fun!
>
> Ken
>
______________________________________________________________________
_
> Ken Stone sasami@h...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>

On Tue, 28 Oct 2003 sasami@... wrote:

> I've uploaded the construction details for my altest two projects - a VCO,
> and a drum simulator that does cymbals, snares, electronic drums etc.
> Have fun!

Ken,

I notice a strange, diagonal pattern in several areas of the Cynare PCB.
Are these decoupling capacitors, etched into the PCB material itself?
If so, is there a science to the size, shape and resultant value, or
is this some sort of twisted experiment?

I've seen inductors and stripline etched into copper cladding, but
never anything like this.

Thanks for sharing your hard work! I've enjoyed experimenting with
a few of your other CGS modules.

--
Robert Kent
hanuman@...

>I notice a strange, diagonal pattern in several areas of the Cynare PCB.
>Are these decoupling capacitors, etched into the PCB material itself?

Exactly.

>If so, is there a science to the size, shape and resultant value, or
>is this some sort of twisted experiment?

Well... it's really just a case of using up some waste space. The actual
capacitance is only in the order of a few pF (perhaps 50 for the entire PCB)
so it really only effects the sharpest transients. The theory is that it can
do so more efficiently than the 100n capacitors due to the larger "surface
area".

Cheers,

Ken
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

>
>where is it :-)

Under modules!

http://www.cgs.synth.net/modules/cgs47_cynare.html
http://www.cgs.synth.net/modules/cgs48_vco.html

Ken

>Jeff
>

_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Wow, ENS76 VCO Option 1. Using the CA3140 chip and LM311 comparator, but
with LM394 instead of the Analog Devices AD818. Believe it or not, I built
a few of those around about 1982. I have the entire Electronotes
collection. Great reference. It's nice to see some of those circuits are
still viable.

-Richard Brewster

At 08:50 AM 10/29/03 +1100, sasami@... wrote:

Ken, you are amazing!

>
> >I notice a strange, diagonal pattern in several areas of the

Cynare PCB.

> >Are these decoupling capacitors, etched into the PCB material

itself?

>
> Exactly.
>
> >If so, is there a science to the size, shape and resultant value,

or

> >is this some sort of twisted experiment?
>
> Well... it's really just a case of using up some waste space. The

actual

> capacitance is only in the order of a few pF (perhaps 50 for the

entire PCB)

> so it really only effects the sharpest transients. The theory is

that it can

> do so more efficiently than the 100n capacitors due to the larger

"surface

> area".
>
> Cheers,
>
> Ken
>

_____________________________________________________________________
__

> Ken Stone sasami@h...
> Modular Synth PCBs for sale

<http://www.blaze.net.au/~sasami/synth/>

> Australian Miniature Horses & Ponies

<http://www.blaze.net.au/~sasami/>