We found this circuit in the October 1987 Radio Electronics magazine. The triac must be controlled according to the heater. The transformer has a low current, of the order of a few hundred mA.
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...