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    EENG242

    Uploaded by

    Hawraa Jaafar
    This document summarizes a student project to build a basic electronic code lock circuit. It includes a circuit diagram and descriptions of the circuit components and their costs. A table outlines the schedule for researching the idea, how the circuit works, finding components, drafting a report, and revising the report over a week-long period culminating on February 25th. In conclusion, the circuit uses a transistor as a simple switch to turn a relay on and off, making it a cheap and easy basic electronic lock that can be used for security or teaching purposes.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    EENG242

    Uploaded by

    Hawraa Jaafar
    25 views6 pages
    This document summarizes a student project to build a basic electronic code lock circuit. It includes a circuit diagram and descriptions of the circuit components and their costs. A table outlines the schedule for researching the idea, how the circuit works, finding components, drafting a report, and revising the report over a week-long period culminating on February 25th. In conclusion, the circuit uses a transistor as a simple switch to turn a relay on and off, making it a cheap and easy basic electronic lock that can be used for security or teaching purposes.

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    EENG242.docx

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    This document summarizes a student project to build a basic electronic code lock circuit. It includes a circuit diagram and descriptions of the circuit components and their costs. A table outlines the schedule for researching the idea, how the circuit works, finding components, drafting a report, and revising the report over a week-long period culminating on February 25th. In conclusion, the circuit uses a transistor as a simple switch to turn a relay on and off, making it a cheap and easy basic electronic lock that can be used for security or teaching purposes.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    25 views6 pages

    EENG242

    Uploaded by

    Hawraa Jaafar
    This document summarizes a student project to build a basic electronic code lock circuit. It includes a circuit diagram and descriptions of the circuit components and their costs. A table outlines the schedule for researching the idea, how the circuit works, finding components, drafting a report, and revising the report over a week-long period culminating on February 25th. In conclusion, the circuit uses a transistor as a simple switch to turn a relay on and off, making it a cheap and easy basic electronic lock that can be used for security or teaching purposes.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 6

    University of Bahrain

    College of engineering

    Department of electrical and electronics engineering

    Student name:

    ID:

    EENG242

    Sec: 1

    Date:

    Instructor:
    Table of contents

    Introduction………………………………………………………………………
    …………………….…3

    Description of the circuit and its


    diagram………………………………………………..…3

    Component details and


    cost…………………………………………………………….………..4

    Time
    schedule……………………………………………………………………………
    ………….……5

    Conclusion………………………………………………………………………
    ……………………….…5

    References………………………………………………………………………
    …………………………..5

    2
    Introduction

    This project is a very simple electronic code lock; the circuit is simply a transistor
    acting as a switch with a relay at its collector. When the transistor is on, the relay
    is working and when it’s off it no current goes through it and it doesn’t work.

    Circuit diagram

    Description

    3
    The circuit is nothing but a simple transistor switch with a relay at its collector as
    load. Five switches (S0 to S4) arranged in series with the current limiting resistor
    R2 is connected across the base of the transistor and positive supply rail. Another
    five switches (S5 to S9) arranged in parallel is connected across the base of the
    transistor and ground. The transistor Q1 will be ON and relay will be activated only
    if all the switches S0 to S4 are ON and S5 to S9 are OFF. Arrange these switches in
    a shuffled manner on the panel and that it. The relay will be ON only if the
    switches S0 to S9 are either OFF or ON in the correct combination. The device to
    be controlled using the lock circuit can be connected through the relay terminals.
    Transformer T1, bridge D1, capacitor C1 forms the power supply section of the
    circuit. Diode D2 is a freewheeling diode. Resistor R1 ensures that the transistor
    Q1 is OFF when there is no connection between its base and positive supply rail.

    Component details and cost

    Item Description Part# Quantity Cost per


    unit (BD)
    1 Switch US09JG 10 0.400
    2 NPN transistor 2N2222 1 0.200

    3 Relay 6v SRD-6VDC-SL-C 1 0.500


    200ohms SPDT

    4 Capacitor 100µF BSME6R3ELL101MF11D 1 0.100


    BV84
    5 Transformer N/A 1 1
    6 Bridge Rectifier KBPC5010 1
    50A 1000V
    7 Resistor 2.2k RC20GF222J  1 0.025
    8 Resistor 100k PR02000201003JR500 1 0.025

    9 Diode 1N4007 1 0.01

    4
    Time schedule

    Time
    Task
    20Feb 21Feb 22Feb 23Feb 24Feb 25Feb
    Researching
    about an
    idea
    Researching
    how it
    works
    Finding
    components
    Drafting a
    report
    Revising the
    report

    Conclusion

    In summary this is a very basic electronic lock circuit using a transistor as a switch
    to turn on the relay or off, it is very easy to make and cheap, this circuit can be
    used as security device or to teach students on basic electronics.

    References

    http://www.circuitstoday.com

    5
    http://www.ebay.com/

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