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An Brief Overview Of Using LEDs In Lab

An Brief Overview Of Using LEDs In Lab. EEC 180A B. Baas Version 1.0. Diode Operation. Diodes are 2-terminal devices with two primary modes of operation—especially from a digital point of view Reversed biased Forward biased. Current. 0 V. 5 V. ~0. anode. cathode. high (too high).

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An Brief Overview Of Using LEDs In Lab

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  1. An Brief Overview Of Using LEDs In Lab EEC 180A B. Baas Version 1.0

  2. Diode Operation • Diodes are 2-terminal devices with two primary modes of operation—especially from a digital point of view • Reversed biased • Forward biased Current 0 V 5 V ~0 anode cathode high (too high) 5 V 0 V I

  3. Light-Emitting Diodes • A Light-Emitting Diode (LED) is a special type of diode that emits photons (light) when current flows through the diode • This is its schematic symbol [http://blog.makezine.com/archive/2006/02/how_to_make_led_throwies.html] [http://en.wikipedia.org/wiki/File:LED_Labelled.svg]

  4. Series Resistor • A series resistor is normally needed to limit current when the diode is forward biased so the LED and the driving gate are not damaged • Reversed biased • Forward biased • Of course the order of the LED and resistor does not matter; i.e., either one can be connected to 5 V or 0 V Current R 5 V ~0 0 V R “on” 0 V 5 V (5V – Vdiode)/R I

  5. Active High and Active Low Operation • The LED can be wired up to light in two ways • ActiveHigh—LED is on when signal is high • ActiveLow—LED is on when signal is low R 5 V 0 V I R 0 V 5 V I

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