[time-nuts] CD4069UB atomic source

Magnus Danielson magnus at rubidium.dyndns.org
Sat Mar 2 17:39:43 EST 2013

Fellow time-nuts,

Bumped into this, which is great humor in several senses:


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! :)


More information about the time-nuts mailing list