In my own case too, my synth does not consist solely of Doepfer
modules. There are also Analogue Solutions and home-built modules.
Early on, I did have to run all the LFO modules from their own
seperate power supply, due to a buzzing kind of interference that
occurred in synchronisation with the frequency of the LFOs.
Apart from this I have mixed both control and signal sources together
on the power supplies.
But I'll certainly think about re-connecting things as was suggested.
Richard


--- In Doepfer_a100@yahoogroups.com , "trebcavxx" <richardbarton@c...>
wrote:

>
> You've highlighted a condition that's been present in my own 75-
> module synth almost from the word GO - pulsating modulation in the
> sound output. It occurs to a greater or lesser degree in virtually
> ALL patches (I have 11 VCOs) - and takesd the form of a cyclic
> variation in amplitude - usually giving the sound a "woo-
> woo.......woo-woo........woo-woo" character rather than a straight
> tremolo effect. As I say, this has happened from the humble
> beginnings of a single VCO setup. I now have 5 seperate power
> supplies in the cabinet. I'm a bit doubtful that LEDs are causing

it

> in my case, but would anyone have a cure for either of our

problems

> I notice the previous mailing has been pretty well ignored.
> Richard
>
> --- In Doepfer_a100@yahoogroups.com , "stuadh" <stuadh@h...> wrote:
> >
> > Hi,
> >
> > I've been reading up on interference caused by LEDs on the
> > power bus in the archives, a problem that I'm having in my
> > homemade and commercial cases. I've minimised the problem
> > by strategically placing the offending modules, but there was
> > some discussion about including large capacitors between the
> > power rails to help stop this problem occuring in the first place.
> >
> > Has anyone done this, and was it successful
> >
> > What constitutes a "large capacitor" and what type. Does the
> > polarity make a difference
> >
> > Yours Aye
> >
> > Stuadh