This circuit is from the 1983 Intersil Databook. The display is plasma and must be excited by a high voltage circuit. The components used in this configuration are not common today.
Using a period sensor, this circuit was found in the February 1986 issue of Radio Electronics...
We found this simple alarm circuit in a 1986 documentation. The circuit uses sensors of the NA...
This circuit is from an American documentation from the 70's using transistors of general use of...