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  • Modeling Phototransistor Optocouplers Using PSPICE Simulation Software
    While designed for measurement parameters like Voltage and Current, PSPICE programs are not comfortable with evaluating or simulating components in photometric units. This application note provides guidelines for using PSPICE to model phototransistor optocouplers.
  • Technical Reference: How Does a Photodiode and Phototransistor Work?
    When light strikes a semiconductor it supplies energy to knock electrons free of their atomic orbits, creating holes and electrons....
  • Optical Liquid Level Sensor Application Note (.pdf)
    This article gives a brief outline to the operating principle behind optical liquid level sensing. An optical liquid level sensor uses an infra-red LED and phototransistor accurately positioned at the base of the sensors tip. When the tip is in air, infra-red light reflects internally round the tip
  • Medical Device Link .
    Two types of optocouplers are available for use in implantable applications. The photovoltaic and phototransistor optocouplers provide gate drive voltage and effective isolation in small surface-mount packages. The 52464 photovoltaic optocoupler consists of an LED and photovoltaic detector
  • Rotary encoders for motors
    accurately than old-style tachometer-generators. The simplest encoder is the incremental style. Typically, it uses a slotted wheel placed between an LED light source and a phototransistor. As the wheel rotates, it alternately passes then blocks light shining on the phototransistor. The phototransistor
  • Making Light Barriers Insensitive to Sunlight
    resistor (LDR), a photodiode or a phototransistor. Such an array may just about function in "lab conditions"; it is, however, miles away from being suitable for practical use. This is primarily due to the lack of consideration paid to external interference factors. The majority of these are other
  • Switch Tips: Photointerrupter switches
    thermal constraints. Switches based on photointerrupters have no contacts, no lubricant, and only one spring. The switching action takes place by depressing a button that interrupts the optical path between an infrared LED and a photodiode or phototransistor. This provides a momentary "low

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