This circuit has 4 operating modes and was found in the 1995 Encyclopedia of Electronic Circuits Volume 5. The circuit works with light or heat sensors.
The output voltage depends on the zener diode. Zener in the range between 1.2 to 12 V rated to 1 W...
This shield with full-wave triggering was found in the Radio Electronics Experimenter magazine of 1989....
We obtained this circuit in a Maxim documentation from the 90s. The circuit is based on the...