This bank of switches can be programmed in a variety of ways for logic experiments. The circuit is from August 1986 Radio Electronics magazine.
This alarm goes off if someone leaves a door open. We found it in the Encyclopedia of Electronic...
The pulse duration is determined by the 100k resistor and the separation by the 1M resistor. The...
This circuit uses high voltage transistors to provide direct power from the 110 V power grid or a...