Phototransistor

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  • Design of Fundamental Phototransistor Circuits
    The common-emitter amplifier circuit (Fig. 1) generates an output which transitions from a high state to a low state when light in the near-infrared range is detected by the phototransistor. The wavelength range for light in the near-infrared region is about 700 nanometers (nm) to 1100 nm
  • 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.
  • Application Note for QVE01040
    The QVE01040 phototransistor optical interrupter switch, consists of an infrared LED emitter that is optically coupled to a phototransistor detector through a 0.3 mm aperture on both sides. The emitter and detector are separated by a slot, 1.1mm wide and 3.7mm deep. The QVE01040 is configured
  • Logic Output Opto Devices
    Most of the Opto devices sensor devices on the market are designed with analog outputs (photodiodes, phototransistors) that requires an analog to digital conversion to interface with the application. Light in Motion offers a range of devices that include the digital conversion, hence simplifying
  • How Does an Optical Encoder Work?
    optical encoder uses opaque and transparent segments arranged in a gray-code pattern. The stator has corresponding pairs of LEDs and phototransistors arranged so that the LED light shines through the transparent sections of the rotor disc and received by phototransistors on the other side. After
  • Guide for DC motor control
    DC Motor Speed Control Circuit using a Phototransistor Optical Interrupter Switch: These controls may be of the open loop type, where light just provides a no-contact, non-wearing circuit input from a person or machine which monitors the output of the motor, or a closed loop type, where the light
  • Implementing a Simple Serial Mouse Controller
    interfaces to the host via a dedicated interface card or an RS-232 port. Their mechanisms are very similar. The major electrical components of a mouse are: ? Microcontroller ? Photo-transistors ? Infrared emitting diode ? Voltage conversion circuit The intelligence of the mouse is provided

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