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Introductory Circuit Analysis (13th Edition)
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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1. Consider the circuit below +12V R1=12K R2 The light-dependent-resistor (LDR) R2 is 1M2 when it's covered and 5002 when exposed to light. Let's model the LED lamp chip as two diodes in series, each with a forward voltage of 5V, so that the total voltage across it, when on, is 10V Assume beta = 100, VBe,on=0.7 and VCe,SAT=0.6V a. Suppose R2 is exposed to light and we assume the BJT is F.A. and the LED's are ON. Verify if our assumptions are correct. If the verification fails, what is a more appropriate state for the BJT and the LEDS? b. Suppose R2 is covered. Determine and verify the state of the BJT and the diodes.
Transcribed Image Text:1. Consider the circuit below +12V R1=12K R2 The light-dependent-resistor (LDR) R2 is 1M2 when it's covered and 5002 when exposed to light. Let's model the LED lamp chip as two diodes in series, each with a forward voltage of 5V, so that the total voltage across it, when on, is 10V Assume beta = 100, VBe,on=0.7 and VCe,SAT=0.6V a. Suppose R2 is exposed to light and we assume the BJT is F.A. and the LED's are ON. Verify if our assumptions are correct. If the verification fails, what is a more appropriate state for the BJT and the LEDS? b. Suppose R2 is covered. Determine and verify the state of the BJT and the diodes.
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