Described in the December 1969 Radio Electronics magazine, this circuit is intended to supply the previous circuit. The circuit is not isolated from the power grid.
This circuit for vehicular use is from an 80's American publication. The circuit has a light...
You can change the output voltage of a fixed 3-terminal regulator using a zener diode. The voltage of...
This circuit was found on a Radio Elettronica (Italy) from April 1974. The circuit can still be...