We found this light relay circuit in year 2000 documentation. The relay is 6 V and the circuit includes a power supply. It can be used to control various devices from the incident light in the LDR.
This circuit is from a 90's Radio Electronics. The circuit operates accurately up to about 15 kHz...
This circuit is from a 1980s Signetics documentation but is valid for modern operating. Next to...
This circuit from a 1979 publication uses FETs which can be BF245 and integrated circuits, unlike...