Indicated for automotive use, this circuit was found in a Popular Electronics from the 90s. The circuit uses a power transistor that must be equipped with a heatsink.
This circuit was found in a 90’s 303 Circuits. The components are from the period and the heating...
Found on Popular Electronics this circuit has variations found throughout this site and section....
The transistors in this circuit from a 1994 technical publication may be BC548 and the 12 V supply...