We found this circuit in a 1967 documentation. The integrated circuit and an operational one of the time. Modern equivalents can be tried out. The power supply is symmetrical.
This circuit turns on your car's backlight when a vehicle coming from behind gets too close to it...
This circuit from the 90s, was found in an Electronic Design of the time. The components used are...
We found this circuit in documentation from Ferranti from 1968. The circuit uses transistors from that...