[time-nuts] CD4069UB atomic source
Magnus Danielson
magnus at rubidium.dyndns.org
Sat Mar 2 22:39:43 UTC 2013
Fellow time-nuts,
Bumped into this, which is great humor in several senses:
http://www.techlib.com/electronics/atomic2.html
The CD4069UB is an unbuffered hex-inverter. About as simple and low-tech
you can get it (6 N-channel and 6 P-channel MOSFETs in total, and yes,
protection diodes on the inputs).
What it actually do is to pick up the 60 Hz or 50 Hz of the power grid,
which on longterm is traceable back to atomic standard/UTC so... yes...
kinda... but we do know how much they vary.
Do notice how the inverters is being tricked into becoming frequency
dividers. This is old-school! :)
Cheers,
Magnus
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