3 Jun
2007
3 Jun
'07
10:01 a.m.
Dave,
thanks for tip.
I noticed from all the pics that the designs didn't follow one standard.
The one basic premise is that the regulators never sit below any IC's,
as this causes the heat to flow over them.
I see that the regulators are mostly on the left or top left, so that
the traces for the power input are kept reasonably short, from pins
1,2,51,52. The one trace that circles the board is the ground trace.
=Dan
[ My Corner of Cyberspace http://ragooman.home.comcast.net/ ]
Dave Dunfield wrote:
Thanks for the
good ideas. I don't recall any S-100 with the regulators
at opposite corners, but then they did make a lot of designs back then.
The ones I own have them situated on the same edge.
I've got photos of a good number of S-100 boards on my site which may be
useful as a reference. Click on the "S-100" title of the S-100 machine
section, or look at any specific machine and click on the installed boards.
There are a few which have regulators in opposite corners (SSM CB processors
for example), and a few which have refulators on opposite ends at the top
(eg: Cromemco System support), but most boards have the regulators clustered
together. What I find interesting is the number of boards where the regulators
are positioned away from the end with the power supplies, with traces running
around the outer edge of the board to carry unregulated power.
Dave
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
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