[sdiy] Source for good power supply schematics

[Roy J. Tellason]

On Saturday 28 May 2005 03:09 pm, Roman wrote:
> Most of the times LM317/337 will do the job. Take a look at the data
> sheet for complete schematic.
> If you like to overdo the powersupply, take a look:
> http://sowa.synth.net/modular/zasilacz.gif

Yes...

> I was already flamed here because of high overdo factor, so please save
> me this time.
> Anyway, whatever you choose, in precision power supply design it's
> more important how you lead the traces than what design is used.
> There's always 1mV here 2mV there and all precision goes down the toilet.
>
> Roman

Good point.  I remember one finicky minicomputer I worked with a little bit 
where you had to measure the voltage across one specific capacitor on one 
specific board and then set it at a particular voltage for the whole thing 
(several racks worth) to work right.  Which all went to hell when the a/c 
wasn't doing its job once...

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

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 
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...

> ----- 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