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.
The buffered phase shift oscillator circuit shown in the figure oscillates at a frequency of 2.9...
This experimental AM microphone was found in an Argentine publication from 1973. The recommended...
This circuit was obtained in an Argentine publication from the 1970s. The circuit can still be...