The circuit is from the Linear applications Handbook of the National Semiconductor of 1994. The components used are not common today.
This simple alarm with latching uses a relay as the main element. The circuit is from a Radio...
This circuit has a maximum output current of 5 A, and the 2N3055 must have an excellent heat sink....
This touch switch has a bistable action and powers an LED. The circuit can be changed to control a...