This circuit can be used with 5 to 15 V sources and the zener diode must be chosen according to the trip voltage of the protector. The circuit blows the fuse when the voltage exceeds the zener value.
We found this circuit in documentation from the 90s. It is a common configuration that is given in two...
This circuit uses a complementary unijunction transistor that is not the common type. The...
Found in old American documentation, this circuit is current as it uses the 555 to modulate an...