Originally suitable for photography applications, this circuit from a Popular Electronics from the 90s can also be used to time plate baths. The components are common, and the sensor is remote.
This circuit generates a pulse of approximately 1 second when the light incident on the sensor...
We found this powerful amplifier that uses common transistors in a 1998 documentation. The power...
This circuit is from 1994 documentation. It consists of a control for several DC motors that are...