Found in the July 1980 Radio Electronics magazine, this circuit uses an integrated circuit from the time and a power Darlington. The Darlington must be equipped with a heat sink.
The purpose of this circuit is to power a small fluorescent lamp from from a 12 V battery. The circuit...
This circuit was found in a 1968’s publication and uses germanium transistors. Equivalents can be...
This circuit generates the busy tone of ordinary telephones. The transistors can be the BC548 and...