Using only one integrated circuit this control was found in an 80's Electronic Engineering. The circuit has the drive's logic information and must be powered by an isolated power source.
This different configuration for a crystal galena radio or modernized since a diode is used, has a...
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
This version of the test lights a lamp when the ring touches the tortuous wire. The SCR can be the...