Re: problem with the DIY kit #2
- yes i tried this -- grounding it to something else and that did not solve the problem. my
feeling is that there is an issue with the power supplies.
--- In Doepfer_a100@yahoogroups.com, "Tim Stinchcombe" <timothy@...> wrote:
> hi David,
> > I does seem like a ground issue though since the noise module hums
> as do the non
> > working cwejman modules. Funny thing is that the spring reverb does
> not hum...
> I think it may be the ground too. From the photo of the kit at
> Doepfer's site, to produce -12V - 0 - +12V from two identical
> wallwarts, the '0V' from neither of them can actually be ground
> (hence why it is OK to run them in series, with the '+12V' of one
> connected to the '0V' of the other, essentially giving the required
> 24V), and I'm assuming that you have been given something very
> similar by Analog Haven. Thus when you have modules hooked up and
> connected to other equipment, there may not be a decent ground
> reference for the modules connected to the kit, which might then act
> weirdly (though I'm a little surprised that any patch leads are not
> supplying this). I'd suggest connecting the ground on the kit bus
> board to a suitable ground somewhere on the external equipment, and
> see what that does.