This old configuration of an audio amplifier has a push-pull two-transistor output stage. Output power is low and the critical components are the transformers. The circuit was found in an 1958’s publication.
This circuit is from GE technical documentation from the 1970s. The circuit can be implemented with SCRs...
This circuit with the CK722 was found in a Raytheon publication from the 60's. The relay is of the...
This bridge circuit is designed for 8-ohm speakers delivering a few watts of power. The circuit is from...