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| 1.4 |
LED Circuit : |
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LED is operated in forward bias. The variation of light power is linear with the applied forward voltage. This linearity is useful in modulating signal that is being sent through a fiber. THe power output of an LED is in milli watts while the current through the device is in milli amperes.
LEDs have much larger voltage drop than a rectifying diode. Typical voltage drop across an LED is between 1.5 to 2 volts. The current through the LED is a few tens of milli-amperes. It is necessary to connect appropriate resistance to account for this drop. |
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