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> I want something I can actually get

Peter, I frequently use the guts from cheap kitchen clocks as
the primary or back-up timing source. IME generally under
30s per year accuracy. I include two tact switches, '+' and '-'
for changing the time on daylight-saving dates, and suggest that
the clock be synched to the radio pips at the time of changing.
Press '+' to add an hour and then, given a time limit of 1 minute
to complete, each press of '+' or '-' will add or subtract 5 secs
to compensate for any clock error. Output of the attached is
0.5Hz. The remains of the clock can still be used - drive the
coil with two PIC pins, reciprocating style, at 1.5V. I've made
a few novelty/special purpose clocks this way


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