[time-nuts] PPS clock module

[Luca]

hi, i made many digital clock circuits. They are made always by using
standard cmos with 12 to 15 volt power supply. high supply voltage means
high noise tolerant circuits, very necessary for lowering error probability
particularly in a time keeping task! It is easy to build up the counter
chain. Less easy is the 1PPS generator (from the 10MHz standard) and in
particular its syncronization with a standard UTC pps. You have to pay
attention to propagation delays that are quite important in a 10 MHz clock
system based on standard B-series cmos. I don't wont to use 74HC, 74AC, or
other faster logic to maintain radiation low.
Bye
Luca
iw2lje


Il giorno dom 27 gen 2019 22:05 John Ackermann N8UR <jra at febo.com> ha
scritto:

> I'm putting together a portable Rb standard and thought it would be nice
> to include a clock on the panel.  I probably haven't hit the magic
> search words, but I haven't found what I'm looking: a module (no
> enclosure) that is driven by an external PPS and shows at least HH:MM:SS
> in 24 hour format on a small LED or LCD display.
>
> I can whip something together with an Arduino, but rather than reinvent
> the wheel I thought I'd ask if anyone knows of something that's ready to
> go.
>
> Thanks,
> John
>
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