Found in American documentation, this circuit uses an automotive ignition coil to generate 20 kV. The transistors used support equivalents.
Published in Radio Electronics in January 1963, this circuit uses 5 transistors of the time. The...
The transistor of this old mixer can be the BC558 and the power can be done with batteries,...
The output voltage of this regulator circuit can be cut (dropping to 1.2 V) from a high level...