I guess the point I hadn't thought of is that if a module does actually want
to use the 5V rail for 5V then it will probably go bang so keeping it off
the buss would be the right thing to do.....
You could use of the control lines with the same argument. being further
away from the main power rails would offer the isolation you need.

I think the safe thing though is to stay away from the buss, not because of
noise but because of the potential risk of damage to other modules.

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

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----- Original Message -----
From: "Guy Drieghe D." < guy@... >
To: < Doepfer_a100@yahoogroups.com >
Sent: Monday, January 12, 2009 7:40 PM
Subject: Re: 1 buss board +/-15V


> 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
>> >
>> > -
>
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