RE: [N8VEM: /] Re: S100 power supplies

["Andrew Lynch" <lyn...@yahoo.com>]

> -----Original Message-----
> From: n8...@googlegroups.com [mailto:n8...@googlegroups.com] On Behalf Of
> Michael Haardt
> Sent: Tuesday, February 03, 2009 5:48 AM
> To: n8...@googlegroups.com
> Subject: [N8VEM: /] Re: S100 power supplies
> 
> 
> > Hi! Does anyone have any ideas for a modern S100 power supply?  I love
> the
> > old linear PSs on vintage gear but they are just too huge for most of my
> > projects.  I have heard that some people are modifying ATX PSs and some
> are
> > even taking Mean Well power supplies and modifying them.
> 
> I would look for "frameless" power supplies.  Many parts sellers offer
> small switching power supplies in a rich variety and very high quality
> at competitive prices.  Depending on their load, many can run fanless.
> You only have to make a case for them to prevent touching wall power,
> e.g. mounting it inside the rack with grid plate around.
> 
> PC power supplies are usually too large (electrically and mechanically)
> and kind of self nuking devices, cheap crap for a market that expects
> to throw the system away after 2-3 years.
> 
> Michael
> 
> [AJL>] 
Hi Michael!

Do you think either of these would work?

http://cgi.ebay.com/NEW-5V-5A-5V-3A-15V-2A-Integrated-Power-Design-Supply_W0
QQitemZ220195738702QQ

http://cgi.ebay.com/15V-3A-15V-3A-5V-3A-Power-Supply-115VAC-Input_W0QQitemZ3
70149901015QQ

The reason I am asking is that I am thinking about an ECB to S-100 bus
bridge design that's been hanging around in my thoughts for a long time.

There is a TRS-80 model 1 to S-100 bus bridge circuit which can be readily
adapted to ECB.  I have posted some initial concept schematics on the wiki.

If anyone has suggestions on how to solve the S-100 power supply problem the
prospect of a mini ECB to S-100 bus bridge becomes a lot more feasible.

You don't need real 18V or -18V rails.  15V or slightly higher would be just
find for most 7812 style SCRs to work.  However, the 7805 SCRs are going to
need ~7V to regulate and I don't know if these PS output voltage can be
boosted up to compensate.

It is too bad they don't make 8/16/-16 volt switching power supply.  :-/

Thanks and have a nice day!

Andrew Lynch