S-100 power supply voltage ranges - test-drb@ccmp.vtda.org

2 Mar 2009

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Subject: S-100 power supply voltage ranges
   From: "Andrew Lynch" <lynchaj at yahoo.com>
   Date: Sat, 28 Feb 2009 10:03:10 -0500
     To: <cctalk at classiccmp.org>

Hi!  What are acceptable voltage supply ranges for an S-100 power supply?  I
am assuming 115VAC input.  My intended application is a small home brew
S-100 backplane.

I have seen the S-100 voltage rails vary but I believe +15VDC, -15VDC, and
+9VDC would be sufficient.  Herb's S-100 page lists the voltages as +18VDC,
-16VDC, and +8VDC but I have seen other voltages used.

Thanks and have a nice day!

Andrew Lynch 
The minimim voltages are +8, +15 and -15 or otherwise said at least 3V greater 
than the on card regulator.

The maximum is generally +10, +18, -18v the caveat here is while most of the 
regulators used will accept up to 25-30V excessive voltages leads to overheating
especially on the +8 buss where the highest current users are.

Ideally well filterd voltages at the minimum on the +8V, +15V busses are desired
and there were a few S100 boxes that did exactly that.

Allison