On Thu, Jan 10, 2002 at 10:19:20AM +0200, Vasile Surducan wrote:
> On Wed, 9 Jan 2002, Byron A Jeff wrote:
>
> >
> > The objective is to drive an ordinary AT motherboard, standard 3.5 in disk
> > and a 100 MB ZIP drive. Standard, if not dated, desktop PC equipment.
> >
>   Why don't you say that ? There are standard PC power supply powered from
> 12V.

And they cost $350 US apiece. Out of my price range. My price range is $30 US.
So that rules out anything but surplus and homebuilt.

Again I'm using this as a learning situation. Also I want to build this
out of commodity components.

The simplest solution is to buy a 400-500W inverter and use a standard supply.

There are several dozen LDO regulators that can do the job.

There are a bunch of buck/boost arrangements that solve the problem.

Bob Blick probably has the cleanest solution of all using a flyback
transformer to generate multiple voltages.

But what I really want is a solution that is akin to Russell and Roman's
switching power supply designs. Simple. Inexpensive. Easy to understand.
Uses commodity components. In that way it's possible to adapt the design
to different situations, and one doesn't get caught up waiting for specialty
components that are usually very pricy.

That why I was very specific with the design challenge. There are bunches of
solutions out there. But there are none that I could find that are simple
and use commodity components.

BAJ

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