[sdiy] Dual power supply solution? - Kits vs 2600

[Ian Fritz]

At 11:01 PM 6/13/05, Paul D Brooks wrote:
>--- harrybissell <harrybissell at prodigy.net> wrote:
> > You will notice that designs using the power supply
> > for references will
> > interact. Turn
> > up the resonance on the VCF and watch the VCOs go
> > out of tune. This
>...
> > A number of the simple 'kits' have this problem. The
> > designers must have
> > a better supply than I do.... or I'm just too
> > fussy...   :^P
>
>Sure, but Harry, all three of the Arp 2600's i've had
>do this... (well, with the VCF freq slider, not the
>Q), and i'm not sure we can call the designers of that
>machine unenlightend.

Nobody's calling them unenlightened, at least not by the standards of their 
day.  But, jeez, that stuff is from 30 years ago.  Why on earth wouldn't 
you want to take advantage of today's highly improved technology?

>Yeah, they could have done
>better with respect to this (and i wish they
>woulda!)... but what are you suggesting in particular?

Look here for some ideas:
http://home.earthlink.net/~ijfritz/sy_cir2.htm
http://home.earthlink.net/~ijfritz/sy_cir4.htm
http://home.earthlink.net/~ijfritz/sy_cir10.htm


>This is a hard problem to tackle for all, and it's
>kind of harsh to come down on the kit manufacturers in
>particular.

It is not hard.  It is simple.

   Ian