This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering an LED. Trigger adjustment is done in a trimpot.
The assembly of this circuit was described in an article in the magazine Radio Electronics of June...
This old radio with a germanium transistor was obtained from an English documentation from the...
This circuit fires by burning the fuse when the input voltage exceeds the value referenced by the zener....