Description: Availability : Australia & New Zealand, Asia Product Type Features Light Sensor: Non-Drifting Phototransistor Street Lighting Photo Control Technology : Electronic Usage Conditions ...

No one likes a flickering light source, but lighting is often ... and found a way to do so with an NPN phototransistor, a resistor, and a 3.5 mm audio plug. The phototransistor and resistor ...

A bit of thought led him to build a reflective sensor which can ... yet adjacent to the phototransistor, he can measure the intensity of the LED’s light as it is reflected off of nearby surfaces.