Found in a 90s Electronic Engineering, this circuit generates sinusoidal signals that depend on the capacitors. The potentiometer adjusts the generated signal symmetry.
This circuit was obtained in a 1979 101 Electronics Projects. The circuit can be assembled easily,...
This circuit with the known PLL 567 can be found in other versions in this section and in this...
Found in Radio Electronics from the 90s, in the figure we have conventional voltage doubler with...