Ldr Dark Sensor Circuit Diagram. Automatic light operated controlled switch circuit using ldr is very interesting circuit idea. Ldr is used in this for sensing the dark and light.
Therefore no current will go from the collector to the emitter of the transistor. The resistance of ldr is inversely proportional to the intensity of light i e maximum in dark and minimum when there is some light falling onto it. The main principle of this circuit is based on the working of an ldr light dependent resistor.
Therefore no current will go from the collector to the emitter of the transistor.
This transformerless automatic light operated night light circuit is very simple and easy. This is an automatic night light circuit without transformer operated by light using light sensor ldr light dependent resistor. A photoresistor can be applied in light sensitive detector circuits and light and dark activated switching circuits. Photodiode darkness sensor circuit using lm358.
