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Re: [N8VEM-S100:1003] S-100 backplane request for help


I got two of these -- $13.29 each plus ~$14 shipping, adjust up to 16.5 volts.

Output(s)     15.0V @ 1.70A
Power     25 Watts
Dimensions     3.08 x 2.00 x 1.10"
Operational Efficiency     83.50%
Operating Temperature     -20~+70�C

The old transformer and p/s in my 22 slot chassis weighs around 20 lb -- the 3 switchers together weight about 4lbs. Nice.


On 7/23/2012 12:03 AM, Paul Birkel wrote:
Terry:  Excellent pointer, and more cost-effective supplier :->.  What
did you do about the 16V rails?

John:  I haven't seen any 16-or-more-bit boards yet and failed to
consider their impact; thanks for reminding me about the near future
(coming soon to a backplane near you ...).

On Sun, Jul 22, 2012 at 4:47 PM, Terry Sare <ts...@sareusa.com> wrote:
And for those of us that want overkill I found this
1 x 350 Watt, Single Output, SE-350-7.5 from Mean Well (SE-350-7.5) = $48.29

Output(s)       7.5V @ 46.00A
Power   350 Watts
Dimensions      8.46 x 4.53 x 1.97"
Operational Efficiency  80.00%
Operating Temperature   -20-60�C

Total with shipping was around $62 so not bad.


-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of John Monahan
Sent: Sunday, July 22, 2012 3:29 PM
To: n8vem...@googlegroups.com
Subject: RE: [N8VEM-S100:1001] S-100 backplane request for help

Paul, 12A on the 7.5V may be a little on the low side unless you are just
sticking to 8 bits.  The 16 bit CPU boards have 3A regulators and if you
have a dual (or more) CPU master slave setup, things could get tight. Agree
20A's is probably best. The 16 V lines are really only used for RS232 etc.
these days and even there, there are converter chips. So 1-2 A is fine.


John Monahan Ph.D
e-mail: mon...@vitasoft.org
Text:    mon...@txt.att.net

-----Original Message-----
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of Paul Birkel
Sent: Sunday, July 22, 2012 11:37 AM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:1000] S-100 backplane request for help

While John has some great information on his backplane/ps page
one point that is missing is the proper power supply sizing for an 8-slot

The IEEE 696:1983 spec is silent on the allowed/anticipated ps-loading per
slot, but it seems reasonable to assume 1 A to maybe 1.5 A average per slot
on the 8V rail, max (most cards hosting a single 1A +5V regulator, with the
occasional dual-regulator configuration like the dual-IDE card)?  That
suggests maybe 12A on the 8V rail, and we might guess 1-2A max on the +16
and -16V rails (since these aren't used much at all on modern cards)?

Am I way off-base here?

FWIW, here are what appear to be the most relevant Meanwell supplies (via
Power Factor, as pointed out by John) -- all of which can have their output
voltages adjusted upwards a bit to fit the 8 and 16 volt

http://www.power-factor-1st.com/g2-series/s-100f.html 7.5V, 0~13.5A  $49.45
http://www.power-factor-1st.com/g2-series/s-150.html  7.5V, 0~20A  $55.45
http://www.power-factor-1st.com/g2-series/s-210.html  7.5V, 0~27A  $70.95
http://www.power-factor-1st.com/g2-series/s-40.html    15V, 0~2.8A  $37.90

The 20A (second line) seems to be the cost-effective sweet-spot "with

Happy hunting :->.

On Sun, Jul 22, 2012 at 1:55 PM, Andrew Lynch <LYN...@yahoo.com> wrote:
Hi!  I�ve gotten a request for some help with the S-100 backplane PCB.
Since it will probably require a PCB respin to fix I would like to
gather up all the feedback and incorporate them as best I can.  Thanks
to Don Caprio there are some excellent builder instructions here:


Please post photos of your completed working S-100 backplane systems
on the wiki in the S-100 backplane folder. Actual builder photos are
*very* helpful for new builders.


There is a new file for S-100 backplane fixes and improvements here:


Please edit with any issues you�ve encountered on how to fix and/or
improve the S-100 backplane.

The photos that are in the folder at the moment are getting rather
dated so they should be retired to the archive as to not confuse any new
Thanks and have a nice day!

Andrew Lynch

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No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2179 / Virus Database: 2437/5147 - Release Date: 07/22/12