The circuit charges a large capacitor which provides the higher current pulses needed to drive the clock’s mechanism. It can power the clock from a single AA battery, and will run until the ...

It can power the clock from a single AA battery, and will run until the voltage on the battery is only 0.5 volts.

Instead of hiding them ashamedly around the back or behind a modest little door, this clock instead displays its batteries out front, proudly putting the double-As in place of hands. The cells fit ...