Vacuuum tube digital circuits (50 year rule)

woodelf bfranchuk at
Thu Aug 31 14:39:05 CDT 2006

Brent Hilpert wrote:

> I was thinking of going for a new-old hybrid design where one stayed with a
> string of decade counter/displays and programmed a microcontroller as a TOD
> clock which then pumped the counter string at 1Hz or 1/60Hz, with bursts of
> fast pulses to invisibly jump over the 60 to 99 range. Any old frequency/event
> counter could be turned into a clock with no or minimal modification. With the
> micro continuously powered, one could power up/down the old power-hungry stuff
> without having to manually set the time on every occasion.
> I'd hazard a guess you won't be running this thing 24/7 at the South Pole
> unless the 'energy accountants' are willing to include it in the heating
> budget :)

Well can't you use neon tube logic and nixie tubes + a few diodes to
make a clock. This ain't high freq stuff here.

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