18 May
2009
18 May
'09
3:13 p.m.
In my IMSAI, I
feed each board power from a dedicated, pluggable line
running to it... ground is still done through the connector.
David Griffith wrote: What did you do with the power feeds on the
backplane? Got any pics? Alexandre Souza wrote: The problem is compatibility.
Imagine that
each S-100 board you would connect on your system has to be modified.
And every board that will be sold, lended or given away, will ALSO
have to be modified.
Why not just change the regulator for a newer one? They are so
cheap nowadays :o)
I get around the compatibility issue by leaving the original
backplane
power in place. Btw, this regulator failure problem is only showing up
on the 5V line. I've not had any issue with the 12V regulators. So,
I run a separate unregulated 8V wire from the primary PSU over to my
regulator board. This board has the new 5V regulated rail. Wires
from cards that have been converted plug in here. I
don't have a lot
of cards, so conversion is not a big deal... but I find
converting the
card easier than replacing its regulator + associated caps.
You can just replace the regulator... but the job is not just the
regulator... it's also all the supporting caps. If the design
overstressed the regulator to begin with, then you are back where you
started with a high heat situation.
jS