This circuit has a traditional configuration often found on this site. The transistor must be equipped with a heat sink and the maximum output current is of the order of 3 A. The voltage is selected by the zener diodes.
This simulation shows how a transistor can be used as a switch turning on and off in the LED. The...
This traditional timer setting can provide time intervals up to a few tens of minutes. The...
This circuit of an ancient American documentation is intended for cathode ray display analysis of low...