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The combined stop-rear lights circuit design is to conform to the following speci- fications: 1. Needs to illuminate 6 LEDS distributed in a grid pattern (e.g. 3 rows x 2 columns, or 2 rows x 3 columns). 2. The intensity ratio between the bright (stop) and dim (rear position) modes is 100/30 (i.e. 100% intensity in stop mode, and 30% intensity in rear position mode). 3. All LEDS are to have equal current flowing through them (equal brightness). 4. Current through each LED is to be no greater than 75 mA. 5. The circuit is to be powered using the car battery. The car battery is described as 4 Ah, 14 V when fully charged, and 12 V at 85 % discharge. Ensure that specification 4 is met for these battery states. You may use any resistor. Consider issues of cost, robustness, number of compo- nents and any other factors in making a good design.

The combined stop-rear lights circuit design is to conform to the following speci- fications: 1. Needs to illuminate 6 LEDS distributed in a grid pattern (e.g. 3 rows x 2 columns, or 2 rows x 3 columns). 2. The intensity ratio between the bright (stop) and dim (rear position) modes is 100/30 (i.e. 100% intensity in stop mode, and 30% intensity in rear position mode). 3. All LEDS are to have equal current flowing through them (equal brightness). 4. Current through each LED is to be no greater than 75 mA. 5. The circuit is to be powered using the car battery. The car battery is described as 4 Ah, 14 V when fully charged, and 12 V at 85 % discharge. Ensure that specification 4 is met for these battery states. You may use any resistor. Consider issues of cost, robustness, number of compo- nents and any other factors in making a good design.

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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Design a circuit for the LED-based rear lights of a vehicle in combined function installations (stop and rear position modes).

The combined stop-rear lights circuit design is to conform to the following speci- fications: 1. Needs to illuminate 6 LEDS distributed in a grid pattern (e.g. 3 rows x 2 columns, or 2 rows x 3 columns). 2. The intensity ratio between the bright (stop) and dim (rear position) modes is 100/30 (i.e. 100% intensity in stop mode, and 30% intensity in rear position mode). 3. All LEDS are to have equal current flowing through them (equal brightness). 4. Current through each LED is to be no greater than 75 mA. 5. The circuit is to be powered using the car battery. The car battery is described as 4 Ah, 14 V when fully charged, and 12 V at 85 % discharge. Ensure that specification 4 is met for these battery states. You may use any resistor. Consider issues of cost, robustness, number of compo- nents and any other factors in making a good design.
Transcribed Image Text:The combined stop-rear lights circuit design is to conform to the following speci- fications: 1. Needs to illuminate 6 LEDS distributed in a grid pattern (e.g. 3 rows x 2 columns, or 2 rows x 3 columns). 2. The intensity ratio between the bright (stop) and dim (rear position) modes is 100/30 (i.e. 100% intensity in stop mode, and 30% intensity in rear position mode). 3. All LEDS are to have equal current flowing through them (equal brightness). 4. Current through each LED is to be no greater than 75 mA. 5. The circuit is to be powered using the car battery. The car battery is described as 4 Ah, 14 V when fully charged, and 12 V at 85 % discharge. Ensure that specification 4 is met for these battery states. You may use any resistor. Consider issues of cost, robustness, number of compo- nents and any other factors in making a good design.
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