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 for Laser Diode power was found in a 2005 Linear Technology manual. In the diagram...
This operational amplifier circuit with power output using complementary transistors was found in a...
This circuit uses germanium transistors and has a push-pull output with transformers. The circuit is...