Cola Clock with Memory

Project Number: 69

Description: In the preceding Cola Clock project, when you disconnected the liquid energy source to replace the cola, the time is lost. Wouldn't it be nice if the clock remembered the time long enough for you to replace the cola? Add the 470uF capacitor to the circuit as shown here. The capacitor stores enough electricity to run the clock for a while if you disconnect the liquid energy source. Don't drink any cola or juice used in this project. Wash the electrodes and the liquid holder.

Snappy: You could also use the battery for electricity storage instead of the capacitor. A battery stores much more electricity than a capacitor, but you don't need much storage here. Batteries are much more expensive than capacitors and they contain chemicals that can harm the environment when you through them away.