QVB21213

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Photointerrupters, also known as photocouplers, are opto-couplings, or optical isolators, that are used to optically isolate the control signal between two circuits. The QVB21213 is an example of a slot type, transistor output photointerrupter. This type of photointerrupter has wide applications in industrial and home automation systems, along with other electrical and electronic applications.

The QVB21213 is a four-pin photointerrupter whose overall dimensions are 28.9 mm x 11.8 mm x 9.3 mm. It operates on a supply voltage of 5 VDC and has a current transfer efficiency of up to 0.6 A. The detector has a slot window width of 0.6 mm, with a 0.04 mm pitch and an aperture of 0.55 mm. The sensor includes two photo diodes, one transmitting and one receiving, and has a switching distance of up to 3 mm. Moreover, it can achieve a response time of 0.2 ms. The current transfer ratio of the detector is typically between 100% and 200%, and its offset voltage is less than 1 mV.

The working principle behind this type of photointerrupter is based on a light transmitter and a light receiver working together. The QVB21213 has two photodiodes, a transmitting diode and a receiving diode, that are separated by a gap. When light interrupts this gap, it is picked up by the receiver and this is interpreted as an ON signal. The transmitted light is generated by the photo diode that is connected to the power supply. When the gap is not interrupted, the receiver is in an OFF state and no current passes.

When the gap is interrupted by a light source, the transmitted light is blocked and the receiver is in an ON state. This then activates the transistor output of the photointerrupter, thereby providing a switching signal. This switching signal is then used to control external electrical circuits.

The photointerrupters can be used in a variety of applications. For instance, they can be used in mechanical and electrical systems for sensing the presence of objects, controlling motor speed, testing printed circuit boards, and providing switching signals for various kinds of circuits. In home automation systems, they can be used to detect the opening and closing of doors and windows, or to sense the presence of human beings. In industrial systems, they can be used to detect the motion and position of conveyor belts and other machinery.

Besides these applications, slot type photointerrupters such as the QVB21213 can also be used in various other types of devices, including computers, peripherals, home automation systems, medical equipment, and industrial automation systems. With the ability to detect the presence of light or the interruption of light quickly and accurately, these devices are highly useful in many different types of applications.

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