This circuit that converts voltages from a battery into high voltages for tube circuits was found in Radio Electronics magazine from February 1960. The transformer is of a special type.
This is a shunt circuit to be used on a multimeter, expanding its scales to measure high currents....
This circuit from an old documentation includes the power supply for the 117 V power grid. It can be...
Although MOSFETs of the type indicated are not very easy to obtain, one can have the circuit as a...