power ON/OFF

02 Apr 99 you wrote here:

RM>> triggering K1 and K3, and then for reliability double it
RM>>.

KF> Or maybe a diode bridge, a thyristor, 2 optotrons, a trigger...
KF> The batteries will last a long time, and reliability higher, maybe...

Of course it's better! That diagram was thrown here only as an example of using
a CMOS clock alarm for a 'subject'. But in practice, sometimes (when the power supply in
the computer is switching) you don’t need any power elements at all.

All the best.
Sincerely, Roman.