This circuit tests the reverse voltage of power diodes. The transformer is high voltage and so are the rectifier diodes. The circuit is from a 1976 QST magazine.
To obtain variable frequency signals, the circuit in the figure is recommended. In this circuit, the...
This circuit was found in old English documentation. It can be improved by using resistors of...
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...