Suggested to power the previous circuit, this power supply was found in the December 1990 issue of Radio Electronics magazine. Integrated circuits must be equipped with heat sinks.
This circuit with unijunction transistors was found in a documentation from the 80's. The trigger...
In this circuit of an old American documentation, the input impedance is the same as the output...
In the figure we have the way to obtain a voltage of 18 V from a 6.3 V transformer with central...