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 converts voltages from 5 to 12 V at voltages of 100 to 400 V. The transformer has a...
We found this CMOS circuit based on the PLL4046 in the December 1989 issue of Radio Electronics magazine....
We found this circuit in an old publication. The circuit can be implemented with modern equivalent...