IMSAI Score update/Spare BYTEs/Got an Altair too

Randy McLaughlin cctalk at randy482.com
Sat Jun 4 18:03:58 CDT 2005


From: "Dave Dunfield" <dave04a at dunfield.com>
Sent: Saturday, June 04, 2005 5:40 PM


> >Don't worry too much about ripple on an S100 supply. The S100 supply is 
>>not regulated -- the regulators are on each of the boards (the 8V input 
>>is designed to be regulated down to 5V, etc). The regulators should take 
>>care of small amounts of ripple on the backplane supply lines.
> 
> Agreed: Rich, what I ment when I told you to check for ripple, would be
> "big" ripple, which would be an indication of the filter caps having
> dried out - not all that likely, but worth checking. The input to the
> regulators should not drop below 7v under load.
> 
> I always scope supplies under initial load tests - You never know what
> odd things you might see...
> 
> Regards,
> Dave
> -- 
> dave04a (at)    Dave Dunfield
> dunfield (dot)  Firmware development services & tools: www.dunfield.com
> com             Collector of vintage computing equipment:
>                http://www.parse.com/~ddunfield/museum/index.html

Generally Imsais have much less ripple than Altairs (bigger filter caps).


Randy
www.s100-manuals.com




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