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photoresistor in Multisim

Discussion in 'Electronic Design' started by [email protected], Apr 20, 2006.

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  1. Guest

    Does anyone know how to place a photoresistor (photocell) in a circuit
    in Multisim? I can not find the component anywhere in the program!
    thanks
     
  2. jack

    jack Guest

    You can model it as a perfect current to voltage converter with a diode in
    series driving a FET -- use the diode in series with the current portion to
    take into account the required diode drop and non-linearity -- and note that
    the relationship is far from linear -- it is a diode after all.

    somethings else to be aware of -- these optocouplers have "memory" and take
    milliseconds to respond -- they are sensitive to temperature (like all
    diodes) and the sensitivity is that of a semiconductor!

    Agilent (whatever they call themselves today) has a model for their HCNR200
    and 201 optocouplers -- this can be applied to the Vishay IL300 as well --
    if you have to do anything requiring precision greater than 8 bits these
    devices are the way to go.
     
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