This 80's circuit uses a germanium transistor like the AC121. The circuit has an output transformer of the type found on many transistor radios of the time.
This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that...
This circuit, found in a 1985 documentation, causes two incandescent lamps to flash alternately. The...
This circuit was found in a 1987 edition of the United States' Hands-On Electronics magazine. The...