This PNP transistor power stage was found in the May 1969 issue of Radio Electronics magazine. The circuit uses a transformer for excitation and requires 10W input for full output power.
This source was originally suggested by Delco in a 1969 documentation to power amplifiers up to 50 W. The...
Found in a Popular Electronics from the 90s, this circuit is suitable for communication between rider...
Found in an Analog Devices documentation from the 1990s, this circuit uses components that admit...