This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it can be used as a shield. The components are from the era.
This circuit was obtained from an American 80's documentation. It can be implemented with modern...
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...
I found this circuit in a doc umentation from the year 1968. It uses germanium transistor and has...