Thanks again for the advice, Laurie !

Yes, now I remember vaguely (this system is 25 yo) that we had to
redesign the original PSU and add that unregulated +15V just for the
clock module, because of interference with the VCO's, which ran on the
same regulated buss. We then connected the clock directly to the PSU -
as per your suggestion - which took care of the interference.

I've redone the old PSU completely, with a slightly less "dirty" +15V,
and was planning to use Doepfer's bussboard to connect the modules. I
guess two loose wires for the dirty line ain't gonna kill my sense of
neatness. ;-)

_guy [diy noob]

> I would check with Dopefer to see if they can advise you of the
> current
> capacity of their bussboard but I would expect it to be in excess of
> 1A so
> your requirements shouldn't be a problem.
>
> If the clock module has decent isolation on it's power rail then there
> should be little or no `leakage' back up the bussboard so in theory
> you
> shouldn't have a problem. Being on a separate rail is a good idea
> and would
> further reduce and potential problems.
>
> If there is only the one device being connected to the dirty 15V
> then you
> might, in the long run, be better off connecting it directly at the
> power
> supply end of the bussboard or to the power supply itself. This
> gives a star
> connection which is far superior at minimising noise problems.
>
> Best Regards
>
> (Mr) Laurie Biddulph
> Phone: +61 (0)2 4340 0938
> Mobile: 0400 257 645
>
> Elby Designs
> ABN: 70 022 727 605
> http://www.elby-designs.com
>
> This e-mail and any files transmitted with it are confidential and
> intended
> for the addressee only.
> If you are not the addressee you may not copy, forward, disclose or
> otherwise use it, or any part of it, in any form whatsoever. If you
> have
> received this e-mail in error please notify the sender and ensure
> that all
> copies of this e-mail and any files transmitted with it are deleted.
> Any views or opinions represented in this e-mail are solely those of
> the
> author and do not necessarily represent those of Elby Designs.
> Although this e-mail and its attachments have been scanned for the
> presence
> of computer viruses, Elby Designs will not be liable for any losses
> as a
> result of any viruses being passed on.
>
> Please consider the environment before printing this email
>
> ----- Original Message -----
> From: "Guy Drieghe D." < guy@... >
> To: < Doepfer_a100@yahoogroups.com >
> Sent: Monday, January 12, 2009 6:35 PM
> Subject: Re: 1 buss board +/-15V
>
> > Thanks, Laurie.
> >
> > I need to draw max. 800mA, so I guess I'll be fine.
> >
> > I want to connect a "dirty" +15V to the Doepfer +5V buss as well,
> but
> > that draws only 100mA. On second thought, maybe better not... that
> > dirty +15V is feeding a high-frequency clock module, so perhaps that
> > would result in crosstalk to the VCO's connected to the regulated
> > +/-15V busses
> >
> >
> > _g
> >
> >
> >> Yes they will. The limitation will be in the current capacity
> which is
> >> fundamentally a feature of the copper track width and thickness.
> >>
> >> Best Regards
> >>
> >> (Mr) Laurie Biddulph
> >> Phone: +61 (0)2 4340 0938
> >> Mobile: 0400 257 645
> >>
> >> Elby Designs
> >> ABN: 70 022 727 605
> >> http://www.elby-designs.com
> >>
> >
> >
> >> ----- Original Message -----
> >>
> >> From: "Guy Drieghe D." < guy@... >
> >> To: < Doepfer_a100@yahoogroups.com >
> >> Sent: Monday, January 12, 2009 6:02 PM
> >> Subject: 1 buss board +/-15V
> >>
> >> >a DIY quicky:
> >> >
> >> >
> >> > Would the Doepfer buss board be capable of carrying +/-15V
> instead
> >> of
> >> > +/-12V
> >> > I assume it does, but just want to make sure...
> >> >
> >> >
> >> > cheers,
> >> >
> >> > _guy
> >
> > -