The figure shows a typical circuit of a variac with a special transformer with sliding adjustment of the winding turns. The circuit is from an Electronics Now magazine from December 1997.
This power supply for those who want to feed and recover 5 ¼ floppy disks was found in the...
This circuit can be powered by a voltage of only 2.5 V. Next to the diagram we have the formulas...
This simple transistor radio with only two germanium transistors was found in a Japanese magazine from...