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Lab Final

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Lab Final

Unit 11 Lab Final: Voltage Regulator with Constant Current Limiting (PORTFOLIO)

Scope and Intention of the Project:
The Lab Final Project is a self-directed project with specific requirements provided.
You will be given a design task which utilizes a standard circuit in the textbook. You will apply knowledge that has been acquired in lecture, assignments, and previous labs.

Your task is to design, simulate, build and test a voltage regulator with constant current limiting as shown in Fig. 11-7 on page 559, Chapter 12 in the textbook. In addition to providing a circuit which operates to the specified functionality, you will submit a project report with required format and contents.


This circuit is to be built according to the following specifications: * Input Voltage Range: + 9 V DC to +15 V DC * Q1 and Q2: 2N3904 Transistor * D1: 1N4733 Zener Diode * R1 = 1.0 kΩ, R2 = 10 kΩ, R3 = 10 kΩ, R4 = 1.0 Ω * Nominal Output Voltage: + 10 V DC * Max. Output Current: 500 mA

Required Test Data: 1. Line regulation for input voltage changes from +9 V to +15 V 2. Load regulation for load changes from open circuit to 1000 Ohm load resistance 3. Graph of output voltages for at least 5 different input voltages, using a 150 Ohm load resistor 4. (Y-axis scaled for output voltage, x-axis scaled for resistive load) 5. Graph of output voltages for at least 5 different loads (include “no load”) at 12 V input voltage 6. (Y-axis scaled for output voltage, x-axis scaled for input voltage) 7. Determination of the exact resistance value for the load current limit.

The proposed steps for this project are as follows: 1. Description of each component function in the circuit. 2. Establishment of selection criteria for any integrated circuits and transistors. 3. Component identification and data sheet collection. 4. Calculations of the values of any resistor, capacitor, or diode. 5. Development of a test strategy determining how to test and evaluate circuit performance. 6. Setup of tests and test documents. 7. Evaluation of circuit performance by conducting tests to determine the required data. 8. Review of circuit for performance improvements and repeated testing. 9. Completion of final report that contains information as required in the report outline.

Report Outline: 1. Coversheet with Name, Date, Project Title 2. Description of Task 3. Theory of operation 4. Photo of built circuit 5. Schematic 6. Parts list 7. Calculations and selection criteria supporting component choices 8. Description of test setups supported by photos 9. Presentation of test results showing all required data and calculations for the project 10. Conclusion with self-rating of successful project completion 11. Recommendations for improvements of the voltage regulator
Report Text Format: 1. Font type: Arial 10 pt. 2. Line spacing: double spaced 3. Page Limit: max. 15 pages
Project Deliverables: A. Building the circuit and demonstrating its intended operation to the instructor. B. Delivery of the Project Report as outlined.
Submission Requirements
The project is due during Unit 11. Please note that your Lab Final will be graded based on the following criteria:

Criteria | Percentage of Project Grade | Project Presentation: | Workmanship of circuit | 25% | Demonstrated function of powered circuit in comparison to requirements | 25% | Project Report: | Coversheet with Name, Date, Project Title | 2.5% | Description of Task | 2.5% | Theory of operation | 5% | Photo of built circuit | 2.5% | Schematic | 5% | Parts list | 2.5% | Calculations and selection criteria supporting component choices | 10% | Description of Test setups supported by photos | 5% | Documentation and analysis of test results to provide the required graphs and data for the Lab Final Project | 10% | Conclusion with self-rating of successful completion | 2.5% | Recommendations for improvements | 2.5% | Total | 100% |

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