Constant Voltage Battery Charger

 

 In order to use a battery until full life expectancy of it, should be ensured that conditions like deep discharging and over charging does not happen. The circuit ensures the full safety of the battery by providing a constant voltage charging mechanism. Thus over charging can be prevented.

Circuit Description.

 

                               In the circuit at first the AC supply is step down to 12V using a step down transformer rated 220V  primary 0-12V secondary, 1.5A Transformer. This is rectified using a bridge rectifier configuration and is later filtered using the 4700uF capacitor. Then this is applied to a series voltage regulator comprising of BC547 and MJE3055. The series pass element is MJE3055. VR 1 is used to adjest the output voltage. 

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Posted in Circuits , DIY , Power Suppy , Projects

Make: Electronics: Learning Through Discovery

Review

                       
                                       Want to learn the fundamentals of electronics in a fun, hands-on way? With Make: Electronics, you'll start working on real projects as soon as you crack open the book. Explore all of the key components and essential principles through a series of fascinating experiments. You'll build the circuits first, then learn the theory behind them!



  Build working devices, from simple to complex : You'll start with the basics and then move on to more complicated projects. Go from switching circuits to integrated circuits, and from simple alarms to programmable microcontrollers. Step-by-step instructions and more than 500 full-color photographs and illustrations will help you use -- and understand -- electronics concepts and techniques.

Discover by breaking things: experiment with components and learn from failure

Set up a tricked-out project space: make a work area at home, equipped with the tools and parts you'll need

Learn about key electronic components and their functions within a circuit

Create an intrusion alarm, holiday lights, wearable electronic jewelry, audio processors, a reflex tester, and a combination lock

Build an autonomous robot cart that can sense its environment and avoid obstacles

Get clear, easy-to-understand explanations of what you're doing and why


Download 

Uploading.com 

megaupload.com 
 

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Posted in DIY , Electronics Circuits , Projects

Do-It-Yourself Computer Repair

 * Do-It-Yourself Computer Repair


http://hotfile.com/dl/45470975/25f08e3/Do_It_Yourself_Computer_Repair.rar.html

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Posted in Computer Science , DIY

Computer Repair DIY

                          It is very useful book for both amateur and professionals. With the help of this book you can troubleshoot most of the general problems that arises in your PC.




http://rapidshare.com/files/142630722/CR1.rar

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Posted in Computer Science , DIY

SMT Soldering Handbook, Second Edition

Review

'This handbook gives an excellent overview of soldering in general and wavesoldering and reflowsoldering in particular. It presents the information in a readable text that any educated person could understand. This is a must book for all engineering libraries and recommended book for most public libraries'
E-Streams, Vol. 3, No 4


'This is a book well worth having on one's shelf in these days of rapid changes and economic stringency.'
Wallace Rubin

'I would very strongly recommend it on the bookshelf of every production engineer or manager involved with soldering surface mount devices. It is very good value for money and very informative.'
Brian Ellis, Soldering and Surface Mount Technology

' Help in planning manufacturing strategy and in making purchasing
desisions relating to consumables and equipment.'
ELEKTOR ELECTRONICS

Product Description

Surface Mount Technology has had a profound influence on the electronics industry, and has led to the use of new materials, techniques and manufacturing processes. Since the first edition of this book was written, electronic assemblies have continued to become still smaller and more complex, while soldering still remains the dominant connecting technique. This is a comprehensive guide to current methods of soldering components to their substrates, written by one of the founding fathers of the technology. It also covers component placement, the post-CFC technology of cleaning after soldering, and the principles and methods of quality control and rework. New sections deal with Ball-Grid-Array (BGA) technology, lead-free solders, no-clean fluxes, and the current standard specifications for solders and fluxes.



Dr Rudolf Strauss has spent most of his working life with a leading manufacturer of solders and fluxes. He was responsible for a number of innovations including the concept of wave soldering, and for many years has been active as lecturer, consultant, and technical author.

His book explains the principles of soldering and surface mount technology in practical terms and plain language, free from jargon. It is addressed to the man, or woman, who has to do the job, but it will also be of help in planning manufacturing strategy and in making purchasing decisions relating to consumables and equipment.

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Posted in DIY , Electronics , Projects

Fabricating Printed Circuit Boards (Demystifying Technology)

Product Description

Jon Varteresian is owner of JV Enterprises, a company specializing in the design and manufacture of printed circuit boards. He offers numerous tips and techniques from his years of experience that guarantee a smooth and painless PC board design and fabrication process using his step by step approach. Numerous illustrations and photographs demonstrate each step of the process. Topics covered in the book include: safety issues, schematic capture, circuit placement and routing, making printed circuit boards, and plans for projects. An extensive resource list and glossary are also provided.

*Gives a complete overview of the printed circuit board design process
*Describes how to produce printed circuit boards in small quantities (ideal for prototypes), with an emphasis on safety
*Author is owner a company specializing in the design and manufacture of printed circuit boards


Download From hotfile.com

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Posted in DIY , Projects