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Phototransistors have several important advantages that separate them from other optical sensors. For example, phototransistors produce a higher current than photodiodes while also being able to produce a voltage, something that photoresistors cannot do. Phototransistors are very fast and are capable of providing nearly instantaneous output. Phototransistors are relatively inexpensive, simple, and small enough to fit several of them onto a single integrated computer chip.
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What are the 3 legs of a phototransistor?
Emitter, base & collector.
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Is a npn phototransistor normally open or normally closed?
It depends on the phototransistor's design. Most are normally open until you shine light on them.
Give the meaning of L and G in L14G1 phototransistor?
In the designation L14G1 phototransistor, the "L" typically stands for "light," indicating that it is a light-sensitive device. The "G" often represents "germanium" or "glass," referring to the material used in the phototransistor's construction or packaging. The "14" and "1" are likely specific model numbers or series identifiers used by the manufacturer to differentiate this phototransistor from others in their lineup.
What are the 3 legs of a phototransistor?
Emitter, base & collector.
How can a phototransistor be utilized as a normally open digital input?
A phototransistor can be used as a normally open digital input by connecting it in a circuit where it is exposed to light. When light falls on the phototransistor, it conducts current, effectively closing the circuit and signaling a "high" digital input. Conversely, in the absence of light, the phototransistor remains off, indicating a "low" input. This setup allows for light activation of digital signals in applications like light-sensitive switches or optical sensors.
How does a phototransistor differ from a conventional BJT?
A phototransistor differs from a conventional bipolar junction transistor (BJT) primarily in its sensitivity to light. While a BJT relies on electrical current for operation, a phototransistor generates current when exposed to light, allowing it to function as a sensor. This makes phototransistors particularly useful in applications like light detection and optical communication. Additionally, phototransistors typically have lower gain compared to BJTs and are designed to be responsive to specific light wavelengths.
What are the characteristics phototransistor 2N5777?
http://pdf1.alldatasheet.com/datasheet-pdf/view/86407/ASI/2N5777.html * High Sensitivity * Economical T0-92 Compatible Package ~MECHASUN~
How does a phototransistor work?
All bipolar transistors are light sensitive: photons striking the semiconductor create electron-hole pairs which make the transistor conduct.In ordinary transistors this is an undesirable source of noise, so they are packaged in opaque metal or plastic cases.A phototransistor on the other hand is packaged either in a metal case with a transparent lens or in transparent plastic to let light in.Note: this is not a significant effect with MOS transistors.
How do you identify emitter base collector in a photo transistor Sm 0038?
To identify the emitter, base, and collector terminals of a phototransistor like the SM 0038, you can refer to its datasheet, which typically provides a pinout diagram. If the datasheet is unavailable, you can use a multimeter to test the terminals: apply light to the phototransistor, and measure the current flow between terminals to determine which is the emitter (typically the terminal with lower voltage) and collector (higher voltage). The base is usually the terminal that controls the current flow and may not be directly connected in some configurations.
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What is photo interrupter module?
A photo interrupter module for a smoke alarm has a gallium-arsenide infrared LED and silicon phototransistor that is contained in a plastic housing. When smoke interrupts the slot between the receiver and sender, the module is switched on.
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