Found in American documentation from the 90's, this circuit consists of a solid state relay with lock. The component values depend on the application.
We found this circuit in a 2002 documentation. It still uses old type plugs, but it can be adapted to...
This circuit sounds when the input voltage drops below the value determined by the zener. The...
When the control level is increased from 0 to 1 (LO to HI), this circuit is activated, which...