We found this circuit in a Radio Electronics from the 90s. Transistors admit current equivalents, especially the power one that is not a common type today.
This amplifier for sound equipment was found in the Philips Databook of 1990. The circuit can be...
This amplifier circuit for listening was found in a book by Hugo Gernsback from 1960. The...
This circuit was found in a 1977 Radio Shack documentation. The circuit is TTL, which must be...