We found this circuit in the 1990 Motorola Linear Databook. The circuit must use symmetric source and has 10times the voltage gain.
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...
It is like to the previous circuit with a lock that keeps the LED on at the end of the timer. The...
At dusk this circuit triggers a relay switching lamps. The circuit can be powered from 6 to 12 V...