Found in American documentation from the 90s, this circuit uses a high voltage relay and has no grid isolation. The high values of R1 and R2 prevent the shock when it touches the sensors.
November 2016 - Mouser Electronics is offering the new series of Littelfuse HMOV varistors with...
Found in documentation from the 1980s, this circuit can generate signals between 6 and 8 MHz. The...
We found this interesting bistable photoelectric control circuit in a 1988 documentation. The...