This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of motors up to about 5 A. It must be equipped with a heat sink.
This bargraph circuit is from an ancient American documentation. It indicates the charge state of...
This circuit provides two outputs of the same signal. One with the original phase and the other...
Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power...