#12 Forward voltage drop for LEDs


In KTechLab all LEDs in a circuit have a forward voltage drop around 0.7 V. So they have the same behaviour as standard diodes.
But most LEDs available have a forward voltage drop around 1.5 to 2 V. So the measuring results differ from the results KTechLab presents.
Can you change the forward voltage drop of LEDs to the correct value or - even better - make it adjustable?


  • Zoltan P

    Zoltan P - 2011-11-02


    thank you for the report. Actually the functionality exists in the GUI, but it doesn't work. In ktechlab you can select the led, and then in the Item editor there are 2 parameters:
    - emission coefficient
    - saturation current
    By modifying these two parameters, one should be able to adjust the forward voltage drop on the led. (see http://en.wikipedia.org/wiki/Diode_modelling#Shockley_diode_model\)
    In practice, these parameters don't seem to have any effect currently. This needs to be fixed.

    Suggested workaround: connect more LEDs in series, and suppose they are "one" led...

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