Found in an old English publication, this circuit applies to the 240 V network, but can be changed to lower voltages. Transistors are mostly general-purpose, admitting modern equivalents.
This circuit was found in a Motorola documentation from 1968. The load current is 10 A. The...
This circuit, from 1988 documentation, allows the use of 15 to 60 W dimmed lamps without the need...
Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load....