We obtained this circuit in a Maxim documentation from the 90s. The circuit is based on the MAX627. This circuit provides an output voltage of 12 V from an input of 4.5 to 12 V.
The circuit shown in the figure is suggested by Micrel, based on the MIC2570 boost voltage...
This circuit can work with almost any JFET. The circuit is from an Electronics Now from April...
This circuit should only be used with incandescent lamps and the SCR should be fitted with a heat...