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 two-transistor emitter-coupled oscillator circuit with capacitive feedback was found in the...
Found in an Electronic Design from the 80s, this circuit generates a 500 Hz signal and can be used...
This circuit is from a 1968 documentation. It makes use of thermistors (NTC) to indicate...