[sdiy] Source for good power supply schematics

[Roman]

> Why that much work for the reference there?  I can't see where anything
needs
> that kind of precision offhand.

most of all - it was good excercise to check if I'm able to make such a
thing.
Modules will work with much worse voltage specs, although 5V outputs really
need to be precise.

> Also,  what do you need -5 for?  I would tend to do things a little
> differently,  making a +5v output but for things like LEDs and such,  and

I drive LEDs from +15 to -15V. +/-5V are used as voltage reference.
All pots that set any voltage are tied to those rails. VCO tuning is
linearly
dependent on 5V, as well as triangle shape. It's used whenever any module
needs reference.

> maybe some logic.  I'd use a separate transformer or winding and bridge
and
> filter,  giving it a lot less on the input side of the regulator.  For
that
> matter,  24V going in to the regulators is a bunch of power to dissipate
> there,  9V difference at what,  2A or so out?  The current limiting is a
nice
> thing to have,  too...

2A would require huge heatsinks. The ones used are quite big, but they get
hot even at 1A. 24V is just scheatic symbol. Actualy there's something like
21.5V It could be more to have some headroom for mains changes.

Roman

>
> > ----- Original Message -----
> > From: "Jesse Yoder" <jojomanee at gmail.com>
> > To: "Synth-DIY List" <synth-diy at dropmix.xs4all.nl>
> > Sent: Saturday, May 28, 2005 7:32 PM
> > Subject: [sdiy] Source for good power supply schematics
> >
> > > I am looking for good schematics for DC power supplies, one regulated
> > > at +/- 12V and one regulated at +/- 15V.  I had to design power
> > > supplies in electronics class in college, but that was a long time ago
> > > and I really don't remember much of anything,
> > >
> > > Thanks,
> > > ~~Ponyboy
>
>