The circuit shown consists of a power stage for relay excitation. 2N3053 can be a BD135 and 2N406 can be replaced with a BD136. R3 depends on the trigger voltage.
This sensitive sound or noise activated key can be used in an alarm system. The circuit is from an...
This experimental flip-flip changes its state by the command of two push-buttons. The state is...
The transformer in this power supply can have a secondary winding from 1 to 15 A of current....