This circuit, found in a 1977 documentation, indicates when the grid voltage goes through zero. Under these conditions, it produces an output pulse whose duration depends on the capacitor.
This circuit was obtained from an American 80's documentation. The operational ones can be...
This circuit uses two Raytheon RC4558 operational amplifiers that are similar to the 741. The...
This configuration for 3 A currents with a maximum input voltage of 30 V appears elsewhere on this...