On 2005-11-11, Aaron Mavrinac wrote:
A lot of digital clocks use ICs that rely on the 60Hz or 50Hz signal
from the mains to keep time. Crack open any cheap alarm clock. They're
extremely unreliable and susceptible to EM interference from other
devices, but they're also very cheap to build.

EMI... so that's the problem... (they prolly don't like the ripple contol
signals either)

the mains cycles keep pretty good time from day to day,
a little active filter or resonant circuit could presumably
make all the difference.. (and probably cost an extra 50c)

--

Bye.
Jasen japun umop - pueleaZ maN