We found this circuit in an Electronics Now from the 1990s. The circuit crashes when light strikes the sensor. Instead of the alarm a relay can be used to drive higher power devices.
This circuit appears in several configurations in this site. This is from American documentation from...
The instrument of this field strength meter, from a 1970s publication, can be a 200 uA...
August 2017 - Mouser Electronics is making available the Gen III generation of Vishay P Channel...