We found this circuit in a 1967 documentation. The integrated circuit and an operational one of the time. Modern equivalents can be tried out. The power supply is symmetrical.
TDK provides a wide range of EPCOS varistors for surge protection through Mouser Electronics....
This circuit is indicated for the analysis of TTL circuits, being powered by 5 V taken from the...
This circuit was obtained from a Philips documentation from 1970. It can be built on modern...