This circuit makes use of a stroboscopic tube, a component that no longer exists today. The circuit is from the 70's and can be adapted to use mains voltage.
This MW bedside radio was found in an English documentation from 1989. It is based on a dedicated...
This simple circuit that senses energy cables (alternating current) through the field produced was found...
In the figure we show a means of changing the output voltage of a fixed regulator, such as 7805 or...