This circuit was proposed by a 1965 Electronic Design. Its purpose is to widen the line transients to make them easier to see on common oscilloscopes.
The presence of a low resistance between the terminals of the sensor causes this modulated...
TDK provides a wide range of EPCOS varistors for surge protection through Mouser Electronics....
This circuit was taken from a Popular Electronics from January 1967. Transistors are from the...