Here is an ultra simple automatic light switch circuit for bedrooms. After construction, connect the input terminals of this circuit in parallel to the internal buzzer terminals of a Quartz-Alarm ...

Here is a great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. Simple touch switch circuit with 4011 – ...

The first words to come out of the mouths of most small children -- after "Mama" and "Dada" -- are usually things like "Bye bye" or "Hi." Not my children. Their first words were "outlet" and "doorstop ...