This configuration was found in an American publication from the 90s. Operators admit equivalents just like transistors. The circuit does not require a symmetrical source.
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...