[sdiy] decoupling modules from power lines?

[Christian.Bergmiller at daimlerchrysler.com]

Hi,

here is just another one joining the list...and the first message i'm sending 
is a question (what a shame) !

I'm currently building a (small) modular synth with ASM-1 VCO's (added 
tri/sine), polyfusion VCF (OTA design), 
selfmade midi to vc (at89c2051) etc...
Yesterday i discovered the VCO's had the tendency to lock (they even modulated 
each other - without any connection
between them but the same power source) i fixed that by adding a tantal 
capacitor from the V- to ground on both VCO modules
(from V+ to ground seems to have no effect so i left them out so far)

Now i'm thinking about equipping every module with a coil followed by a 
capacitor to gound for the V+ and V- power lines.
(tro prevent further problems so far undiscovered)
I would try 1mH and 2,2uF, but would like to hear your suggestions bevor i 
order a greator amount of these values from
my favorite supplier...

Hope to hear something helpful :-)

Christian

(and please don't mind the bad english...)