MicroVAX 3100 Model 95 Ripple

Rob Jarratt robert.jarratt at ntlworld.com
Sat May 9 11:32:05 CDT 2020



I have recently been trying to improve the ripple on the output of my
MicroVAX 3100 Model 95 PSU because occasionally it would fry a memory
module. I replaced a bunch of capacitors, some of which had started to leak.
However, the ripple does not seem much better. There is a scope trace here: 




Ch1 is the 12V output and Ch2 is the 5V output. I had an old RD53 connected
as a dummy load. It is possible that the memory was breaking because of
occasional spikes that are worse, but I don't know. Does that seem OK?





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