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 was found in Radio Electronics magazine from April 1961. The device has a slot for...
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...
Found in a 1968 Motorola manual, this DC circuit uses components from the era. The circuit fires in...