Jim wrote:

> Hmmm ... what does that 2-transistor supply
> look like regulation and ripple-wise over:
>
> 1) a consumer temp range
> 2) a commercial temp range
> 3) an automobile temp range
> 4) mil temp range?
>
> I have a little more faith in the the temp-comp
> circuitry and other features 'integratated'
> into a chip on a silicon die ... this is *not*
> meant to run-down the 2-Q SMPS design which
> certainly has it's benefits but just a reminder
> that *all* facets of a SMPS must beconsidered
> before electing it to the post as 'panacia of
> all ills power supply' ...


Hi, just for the record, I NEVER suggested my 2-trans
SMPS design was anything like a "panacea" for anything.
These mega cheap simple circuits (like many things
I put on the net) are suitable for really cost sensitive
designs, and for hobby use etc where generic transistors
are always available when specialist chips aren't.

And because of my particular personality traits where
I love doing things with the bare minimum of parts,
just to see IF it can be done and just how good it
turns out. ;o)

I can buy the latest trendy chip, read the datasheet and
hook it up like anyone can. It's my WORK to make things
as reliable as possible, my FUN is to hang out on the
piclist and see if a solution can be found using just
one transistor.

These "wacky" designs are done often in response to a
challenge or as a mental exercise. If I wanted to compete
with a specialist chip I would add a couple more
transistors... ;o)

Out of curiosity, I really don't think the 2-tran
circuits I posted were *that* temperature sensitive.
Probably less so than most load circuits??
-Roman

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu