This circuit, with 1 A output, was found in a 1975 documentation. The transistors admit equivalents and the transformer has windings according to the voltages being worked.
This circuit was found in an old American magazine and could make use of more modern components...
This circuit was obtained in a 1969 documentation. The circuit modulates both the emitter current and...
This circuit was found in a publication for radio amateurs in 1978. The circuit is an automatic gain...