Cgs synth

I've uploaded the modules section of the CGS site to the primary server.
There are a few pages that really shouldn't be there yet, so consider them
as previews. The rest ot the site will be uploaded later on.

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

Hi Ken

I hope this site crash has not upset to much your projects !
I must say those "preview" modules look very promizing ! In particular
the Random Switch and Analog Switch module.

Just a remark concerning the analog switch, I had a very quick glance
at the schematic and noted that it can handle positive signals only.
Are you considering the possibility of handling negative and positive signals
? For instance by powering the 4066 between +7v and -7v, or by biasing
positively the inputs then compensate by a negative bias at the output ?

Cheers

Yves

Yves.Usson@...
http://www-timc.imag.fr/Yves.Usson/personnel/SDIY/

-------------------------------------------------
envoyé via Webmail/IMAG !

>I hope this site crash has not upset to much your projects !

Just a minor hickup :)

>I must say those "preview" modules look very promizing ! In particular
>the Random Switch and Analog Switch module.
>
>Just a remark concerning the analog switch, I had a very quick glance
>at the schematic and noted that it can handle positive signals only.

Bzzz. Wrong! It does handle full range including positive and negative
excursions, though I did just spot an error in the diagram. Pin 7 of the
4066 goes to -0.6 volts. The switches are all in the summing node of op-amp
circuits, thus in theory see current, but never voltage while closed, thus
can operate over the whole range. When opened, they do see voltage, which is
where all thoes diodes come in - they clamp the negative excursions to
-0.6V, and thus stay within the operational limits of the switch :)

I've done the same in my sequencial switch, and I'm pretty sure it's in some
of my other designs too.

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