Karlsson nixie clock losing time

[James]

A friend just dropped by with a Karlsson clock that he says is losing
about a minute a day. It was the first time I've seen one of these in
person and I'm not familiar with the circuit. I'm impressed by the fit
& finish, but underwhelmed by the performance. The tubes glow dim and
look almost grayish, clearly multiplexed with noticeable flicker when
I scan my eyes past it. Nowhere near as attractive as the bright,
sharp directly driven tubes in all the clocks I've built.

Anyway has anyone here worked on one of these before? Is the timing
derived from the power line or does it use the CPU clock crystal? I
checked the one electrolytic capacitor and it tests fine for ESR. Did
a visual examination and don't see anything amiss. Figured I'd ask
around before I get out the scope and start poking around.

[David Forbes]

Ask Jeff Thomas. He dissected one and wrote it up. I think it has software bugs.

David Forbes
http://www.cathodecorner.com/

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