You must design a circuit for a light emitting diode. The circuit must be powered by a 3.3V power source and you need a current of at least 2 mA current through the diode to ensure sufficient brightness. At the same time you would also like to limit the diode current to no more than 5 mA to limit your power consumption. Calculate a suitable value of the current limiting resistor for this circuit if it is given that the LED will have a forward voltage drop of 2.1 V over it. Select a real resistor value from the E12 standard resistor series. Show your reasoning and calculations.

You must design a circuit for a light emitting diode. The circuit must be powered by a 3.3V power source and you need a current of at least 2 mA current through the diode to ensure sufficient brightness. At the same time you would also like to limit the diode current to no more than 5 mA to limit your power consumption. Calculate a suitable value of the current limiting resistor for this circuit if it is given that the LED will have a forward voltage drop of 2.1 V over it. Select a real resistor value from the E12 standard resistor series. Show your reasoning and calculations.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

4. Design of an LED circuit
You must design a circuit for a light emitting diode. The circuit must be powered by a 3.3V power
source and you need a current of at least 2 mA current through the diode to ensure sufficient
brightness. At the same time you would also like to limit the diode current to no more than 5 mA
to limit your power consumption. Calculate a suitable value of the current limiting resistor for this
circuit if it is given that the LED will have a forward voltage drop of 2.1 V over it. Select a real
resistor value from the E12 standard resistor series. Show your reasoning and calculations.

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