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 ...

The collector is biased positively with respect to the emitter and the base-collector junction is reverse biased. A phototransistor remains inactive until light falls onto the base. Light activates ...

[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 ...

Here is a short primer on integrating digital isolators in smart home devices to ensure safety and reliability.

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 ...

Ceci conduit à un autre type de photodiode : les photodiodes PIN. Le courant d'éclairement du phototransistor est donc le photocourant de la photodiode collecteur-base multiplié par le gain β du ...

The resonance of the light, detected by a phototransistor is altered by the presence of any molecules bound to the antibodies and this change (or SPR shift) quantifies the amount of protein ...