Cornell students [Michael and John] took on an interesting approach for their final project and designed a phototransistor based eye-tracking system. We can definitely see the potential of this ...

Phototransistors are solid-state light detectors with internal gain that are used to provide analog or digital signals. Phototransistors are used in almost all electronic devices that depend on light ...

[Tweepy] wanted to measure and quantify this effect, and found a way to do so with an NPN phototransistor, a resistor, and a 3.5 mm audio plug. The phototransistor and resistor take the place of a ...

All optocouplers consist of two elements: a light source — almost always a light-emitting diode (LED) — and a photosensor — typically a photoresistor, photodiode, phototransistor, silicon-controlled ...