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 of two transistors was found in a Japanese magazine in 1967. The transistors are made...
The oscillator of this circuit operates around 8 MHz, but the output will be at a frequency three times...
Found in American documentation from the 90s, this circuit converts 28 V to 155 V with a frequency of...