Functions of Resistor Contd. (LED Current Limit)

Just like in transistor biasing as discussed yesterday LEDs(Light Emitting Diodes) too are very
sensitive to high currents. A resistor
when placed in series with the LEDs
regulates a proper flow of current
through them.

To calculate the value
of a series LED resistor, the
following formula may be used:
R = V –( N.V ) / I
Here

    R = Series LED resistor
    V = supply voltage
    N = number of LEDs in series
    V(LED) = forward voltage of the LED used and
    I = current through the LEDs (10mA optimum).

These resistors are generally of low values so that the over all performance of the circuit is not affected.

written by Anthony

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