This circuit was found in the magazine of radio amateurs 73 in a 90's edition. The components are current and the transistor is of general use.
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...