This sequential circuit of LEDs was found in a Popular Electronics from the 90s. The circuit can be programmed and an adaptation consists of using optical couplers to drive power loads.
The photosensor integrated circuit used in this circuit is not common today. It is a device that...
We found this circuit in an American 1980s documentation. The operational ones used are not common...
This digital touch volume control was obtained in a 1988 publication. Each touch of the sensor...