This physical line servo control uses components that are not currently common. The circuit is from an 80's documentation and is powered by a voltage according to the servo.
We found this circuit in a 90's EDN. The circuit is based on a control integrated that is still...
5874E) This circuit uses an optocoupler to switch a load on the power grid. The circuit is from...
This circuit has appeared on our site several times as a battery status monitor. In this...