Experiment-04[1] - red LED. Carefully measure the voltage...

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Experiment 4: LEDS and Zener Diodes E x p e r i m e n t 4 LEDs and Zener Diodes Objectives: In this experiment you will: Investigate the characteristics of light emitting diodes (LEDs) and some of their applications. Investigate the characteristics of Zener diodes and calculate their voltage regulation.
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Experiment 4: LEDS and Zener Diodes Circuit Diagrams
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Experiment 4: LEDS and Zener Diodes A. Light Emitting Diodes Procedure A.1. Connect the circuit of Fig. 1 using the red light emitting diode (LED). Starting from a value of 0.5 V, increase V S in steps of 0.5 V and measure the LED voltage and current for each V S . Do not exceed 30 mA of current in the diode. Write the results in Table 1. A.2. Repeat Part A.1 with the diode connection reversed. Write the results in Table 1. A.3 Plot the forward and reverse characteristics of the LED and determine the incremental resistance of the diode in the forward and reverse conducting regions. A.3. Connect the circuit of Fig. 2 using the
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Unformatted text preview: red LED. Carefully measure the voltage levels and conduction angles in the forward and reverse directions, using the oscilloscope. Compare the measured values with those predicted from the value of V S and the diode characteristics. Calculate the power dissipated in the forward and reverse directions. Experiment 4: LEDS and Zener Diodes B. Zener Diodes Procedure Refer to Fig. 3. B.1. Connect the circuit and measure V Z when V S is 15 V. B.2. Reduce the value of V S in steps of 0.5 V, and measure V Z and I Z . Record the valuesintable 2. Calculate the power dissipation in the Zener diode. B.3. Plot a curve of I Z versus V Z . Calculate the value of the Zener resistance r Z . What is the minimum value of V S required to get Zener diode breakdown? Take additional measurements around this minimum V S to answer the following two questions: What is the value of the knee Zener voltage, V ZK ? What is the value of knee Zener current, I ZK ?...
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This note was uploaded on 02/07/2011 for the course EECE 312L taught by Professor Ghassandeeb during the Fall '07 term at American University of Beirut.

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Experiment-04[1] - red LED. Carefully measure the voltage...

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