Friday, February 20, 2026

Ordered new components for 6V regulator SMS card for IBM 1130

REPLACING ALL RESISTORS

I found a few with significant drift but most were off nominal enough to warrant my replacing all of them. I ordered the correct parts from Digikey and should have them early next week to swap onto the board. In the interim, I will put the card together with its existing parts and do some other debugging of the issue where the regulator's circuit breaker trips on power-up if the system had been on for a while and only recently powered down. 

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