[sdiy] That old modular power supply question (again)

[Needham, Alan]

Each option has its advantages, surely.
I wouldn't worry about adding the second supply, common the negatives
such that you have 0v, +12v and +15v rails - dead simple.
I would use a single power switch on the mains to both, but that is open
to opinion with this scenario - if a circuit used both supplies then it
could be more of an issue.
The ETI4600 synth uses no less than SIX rails from the power supply -
never been a problem!



-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Julian
Sent: 15 December 2009 17:42
To: David G. Dixon; 'synthdiy DIY'
Subject: Re: [sdiy] That old modular power supply question (again)


> I would suggest either option 3 or 4....


Lots of people saying run all from 12v or all from 15v, but im left
wondering why?

Effectivly what im saying is that i can run the 15v from one psu and the
12v from another if need be.

This would be akin to using two modulars and patching between them.

Why should i bother going to all the potential stress and trouble of
running modules out of spec?  Again, a lot of this system is 
made from commercial modules, for which i dont have the schematics.

What is the advantage of any option?

Again just having 2 power supplies (one for 12v, one for 15v) or just
one large 15v psu, and regulating down to 12v on the busses 
themselves seems like so much more simple that i cant understand why
there is need to do otherwise?

Thanks, Julian 

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