This lockable two-position servo control system was found in documentation from the 1990s. The error amplifier can be an operational amplifier and the sensors are phototransistors.
We found this circuit in old American documentation. It can be implemented with more modern...
The purpose of this circuit is to control the high and low light of a car, detecting when a...
This powerful transmitter for the 27 MHz band was found in a Japanese publication from 1961. The...