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 oscillator can generate 2 to 10 MHz signals and was found in an American 1980s documentation. The...
This flasher was originally intended for Christmas tree lamps. The circuit is from 1974 and uses...
In the figure we have the way to add hysteresis to an operational amplifier. The relationship...