Re: LED & Resistor befuddlement

From: Mike Turco (miketurco_at_yahoo-nospam4me.com)
Date: 06/03/04

  • Next message: RM: "Re: Any volunteer projects for embedded software?" 
    Date: Wed, 2 Jun 2004 17:45:54 -0700

    > > >I have never been able to get an IV curve on LEDs and I have not
    > > >measured it myself. Anyone know how low the current must be to get the
    > > >voltage drop below 1 volt?

    Once a diode is turned on, the voltage remains pretty much the same
    regardless of the amount of in-spec current you run through it. If you limit
    the current too much, the LED won't be bright enough, or won't turn on.

    In general, LED's drop between 1.5 and 2V. As you vary the current through
    the LED, you will see some variation in the forward voltage, but not enough
    to make a difference, and I doubt that a reliable way to use these devices.

    Mike

  • Next message: RM: "Re: Any volunteer projects for embedded software?"

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