Popsicle Stick Switch
A momentary contact Single Pole Single Throw (S.P.S.T.)
switch that is based on a Popsicle Stick. It is easy to build and the builder learns how a switch works.
hand-held electric drill and 1/8" bit
Alarm Bag
This project uses simple electronics to create an alarm circuit for a shoulder bag. The key components are two 1/8″ headphone jacks with “normally closed” switches, which detect whether a plug is in the jack. Wiring two of these jacks in series with an alarm creates a circuit that activates when both plugs are removed. […]
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