This circuit was taken from a Popular Electronics from the 90's. The power step can be changed to operate with the most powerful LEDs available today.
Found in a 90s Popular Electronics, this circuit allows to select the operating ranges between...
This circuit was obtained in a 1960 transistor manual from Sylvania. The circuit uses small...
This simple unijunction circuit is from a Radio Electronics from July 1963. It can be assembled with a...