Design And Construction Of A 16-Way Clap Operated Switch
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- PROBLEM OF THE PROJECT
- APPLICATION OF THE PROJECT
- RESEARCH QUESTION
- PROJECT ORGANISATION
CHAPTER TWO
LITERATURE REVIEW
- OVERVIEW OF THE STUDY
- REVIEW OF THE RELATED STUDY
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CHAPTER THREE
3.0Â Â Â Â CONSTRUCTION METHODOLOGY
3.1Â Â Â Â Â BASIC OF THE SYSTEM
3.2Â Â Â Â BLOCK DIAGRAM OF THE SYSTEM
3.3Â Â Â Â Â SYSTEM OPERATION
3.4Â Â Â Â Â CIRCUIT DIAGRAM
3.5Â Â Â Â Â CIRCUIT DESCRIPTION
3.6Â Â Â Â DESCRIPTION OF COMPONENTS USED
3.7Â Â Â Â Â POWER SUPPLY UNIT
CHAPTER FOUR
4.0Â Â Â Â Â TESTING AND RESULTS
- CONSTRUCTION PROCEDURE AND TESTING
- INSTALLATION OF THE COMPLET DESIGN
- ASSEMBLING OF SECTIONS
- TESTING OF SYSTEM OPERATION
- COST ANALYSIS
CHAPTER FIVE
- CONCLUSION
- RECOMMENDATION
- REFERENCES
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Clap Operated Switch Circuit
This circuit is built around timer IC 555 (IC1), CMOS IC 74LS93 (IC2) and five BC547 npn transistors (T1, T2, T3, T4 and T5). Transistor T1 is used as the pre-amplifier and the rest are used for driving the relays.
Circuit Diagram: Clap Operated Switch
A small condenser microphone is connected at the base of transistor T1, which is biased from resistor R1 (10 kilo-ohms). The clapping sound is converted into electrical energy by the microphone and amplified by transistor T1. The transistor output is fed to the monostable circuit wired around IC 555. Output pin 3 of the timer is connected to the clock input of divide-by-16 IC 74LS93.
The outputs of IC2 are fed to npn transistors T2, T3, T4 and T5 via 100ohm resistors to drive relays RL1, RL2, RL3 and RL4 connected to appliances 1 though 4, respectively. Freewheeling diodes D1 through D4 connected across the relays protect the transistors from the back electromagnetic field (e.m.f.) produced by the relays.
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The output states of IC 74LS93 (Q0 through Q3) for different numbers of claps are shown in the table.
Construction & testing
The circuit is powered from regulated 5V DC. For testing the circuit, disconnect the resistors from the outputs of IC2 and connect four LEDs in series with 220-ohm resistors between the outputs and ground. Now switch on the power supply and clap near the microphone. You can see the four LEDs glowing in the manner shown in the table. A reset push switch is provided to switch off all the ‘on’ devices.
Now you can connect the desired appliances to the relays and control them with your claps.
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