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Sophistications in theft and other criminal damages necessitates for the symbiotic blending of technology with security needs. In this research, electronic switches in the form of sensors were used to implement a point-to point intrusive monitoring system for the detection of an unauthorized access to commercial and residential buildings. The system is a simple and reliable security system and uses switch sensor technology to revolutionize the standards of living. The system is also simple, adaptable and cost-effective. It is designed in six major units which include; the power supply, the input/sensor micro-switches, the monitoring and indicator, the timing, the tone generation and output units. To ensure steady power supply in the circuit, the power unit constitutes both the mains and DC supplies. The alarm unit are being activated by the normally closed sensor micro-switches unit which is connected in an electronic/door mat at both the entrance and exit of buildings. In order to facilitate easy location of the intruder, the exact point of intrusion is being determined by the monitoring and indicator unit which constitutes the quad R/S flip-flop IC and LED's. The timing/tone generation unit is built on the 555 timer IC, in the Astable mode, which output keeps changing as far as there is a breakage of the sensors. The output of the system is mainly the LEDs and buzzer, which gives electrical light and audio signal to notify the owner of an intruder in the building. Major design issues considered include; efficiency, portability, cost-effectiveness, durability, compatibility as well as the availability of required materials. This system works on the principle of the micro-switch sensor and dependent on the condition that an intruder entered through the door and stepped in any one of the switches under the mat. Verification and validation of the system indicate compliances to design specification hence the output requirements were met.
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This research focuses on detection of unauthorized access to residential and commercial buildings when the residents are far away from the access gate of the house. The system is a simple and reliable touch activated security system and uses sensor technology to revolutionize the standards of living. The system provides a best solution to most of the problems faced by house owners in their daily life. Due to its simple electronic components nature, it is more adaptable and cost-effective. The system is divided into three units; the power supply unit which employs the use of both DC battery and mains supply to ensure constant power supply to the circuit, the trigger unit which is responsible for activating the alarm unit and designed to have much time and period and moderate sensitivity in order to reduce the rate of false alarm, and the alarm amplitude unit which main function is to produce amplitude alarm sound when triggered by the trigger unit with the aim of producing a large audible sound that can alert the entire neighborhood or scare an intruder away. The design of the system was achieved by considering some factors such as economy, availability of components and research materials, efficiency, compatibility and portability and also durability in the design process. The performance of the system after test met design specifications. This system works on the principle of touch sensor. The general operation of the system and performance is dependent on the presence of an intruder entering through the door and touching any part of the door. The overall system was constructed and tested and it work perfectly.
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This paper presents experiences and results from a project task in power electronics for students at Chalmers University of Technology, Goteborg, Sweden, based on a flyback test board. The board is used in the course Power Electronic Devices and Applications. In the project task, the students design snubber circuits, improve the control of the output voltage, improve the gate drive of the main MOSFET transistor and study the influence of stray inductance. The project goals (the circuit improvements) are given, but the procedure for solving the problems and obtaining the results is not specified. Instead the students have to make their own specification in order to reach the goals. ldquoToolsrdquo that are given to the students are the hardware, measurement equipment, an example of the circuit in the circuit simulation software PSpice, and lastly lectures covering the material needed in order to attain the project goals. The project design builds on the ideas from the CDIO (Conceive, Design, Implement, Operate) initiative, where students are encouraged to consider the complete process structure. The result found was a substantial engagement by the students, who had both positive and negative reactions. The negative reactions were mainly that the project specification was too vague, in other words in the (C=Conceive)-phase of the CDIO structure. Further, the teachers observed increased learning, which also was noticeable for the students performing their M.Sc. thesis within the power electronics design area. Finally, it was found that a final written exam is definitely still needed to assess students adequately in the course.
Conference Paper
We present an integrated system that uses speech as a natural input modality to provide user-friendly access to information and entertainment devices installed in a real home environment. The system is based on a combination of beamforming techniques and speech recognition. The general problem addressed in this work is that of hands-free speech recognition in a reverberant room where users walk while engaged in conversation in the presence of different types of house-specific noisy conditions (e.g. TV/radio broadcast, interfering speakers, ventilator/air-condition noise, etc). The paper focuses on implementation details and practical considerations concerning the integration of diverse technologies into a working system.
Contenido: 1) Diodos semiconductores; 2) Aplicaciones de los diodos; 3) Transistores de unión bipolar (BJT); 4) BJT y polarización DC; 5) BJT y análisis con AC; 6) Transistores de efecto de campo (FET); 7) Polarización de los FET; 8) Amplificadores FET; 9) Respuesta de frecuencia de BJT y JFET; 10) Amplificadores operacionales; 11) Aplicaciones de los amplificadores operacionales; 12) Amplificadores de potencia; 13) Circuitos integrados lineales-digitales; 14) Retroalimentación y circuitos osciladores; 15) Fuentes de poder (reguladores de voltaje); 16) Otros dispositivos de dos terminales; 17) Dispositivos pnpn.
The aim of home automation is to control home devices from a central control point. In this paper, we present the design and implementation of a low cost but yet flexible and secure Internet based home automation system. The communication between the devices is wireless. The protocol between the units in the design is enhanced to be suitable for most of the appliances. The system is designed to be low cost and flexible with the increasing variety of devices to be controlled.
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Robert L. Boylestad and Louis NashelskyElectronic devices and circuit theoryEighteditions. Prentice Hall (Pearson Education Inc.) 2002 pp 875
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A textbook of Electrical Technology
  • B L Theraja
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Theraja, B. L.,& Theraja, B.K (2002),"A textbook of Electrical Technology", S. Chand and Company Ltd. New Delhi, India 2002, pp. 220, 920, 924, 1712-1716.