This photoelectric circuit was found in a 70’s Ferranti's documentation. The circuit uses an operational one from that time. Modern equivalent components can be used in a new project.
In the figure we show our first circuit that consists of a simple touch switch capable of driving a...
This circuit was found in an 80's Electronic Engineering. The power supply must be symmetrical. The...
This metal detector was found in a French magazine Radio Plans from 1977. The phone can be a...