This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be done based on transistors with known gains.
This power supply makes use of a capacitance multiplier. C2 can be 100 uF which with the action of...
This circuit, which appears in other applications on this site, was taken from a 2000...
Mouser Electronics is already providing new MOSFETs EF SIHx28N60EF of Vishay series for voltages...