This circuit visually indicates that a high voltage is present in an outlet or other point. The neon lamp is common, and the appearance of the assembly is suggested in the same figure.
In the figure a circuit that is the basic application of NE567 for the detection of a tone applied to...
This circuit is from an old Italian publication, using components that are no longer manufactured, but that...
We found this switching circuit in a technical documentation from National Semiconductor. The...