We found this circuit in a 1967’s Electronics World. The circuit can be made with modern equivalent transistors. The selection is made by the tuned coil.
This circuit can supply negative voltages of up to 32 V with high current intensity (up to 1 A),...
This circuit was found in a 1968’s General Electric documentation. The circuit uses components from...
With each touch on S1, an output of 4017 is activated, this in sequence 3, 2, 4, etc. These...