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Dual Band Mobile Jammer for GSM 900 & GSM 1800
from BlackMASK 28/06/2010 14:53 |
Downloads: 15
Comments: 1 |
Communication jamming devices were first developed and used by military. This interest comes from the fundamental objective of denying the successful transport of information from the sender (tactical commanders) to the receiver (the army personnel), and vice-versa. Nowadays, mobile (or cell) phones are becoming essential tools in our daily life.
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AUTOMATED TRAFFIC SIGNAL CONTROLLER
from Santosh 18/03/2010 12:18 |
Downloads: 33
Comments: 1 |
| This automated traffic signal controller can be made by suitably programming a GAL device. (For GAL programming you may refer to the construction project published on page 52 in EFY’s September issue.) |
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House Security System
from Santosh 18/03/2010 11:23 |
Downloads: 231
Comments: 1 |
| Here is a low-cost, invisible laser circuit to protect your house from thieves or trespassers. A laser pointer torch, which is easily available in the market, can be used to operate this device. |
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ELECTRONIC SECURITY SYSTEM
from Santosh 18/03/2010 11:19 |
Downloads: 229
Comments: 1 |
This reliable and easy-to-operate electronic security system can be used
in banks, factories, commercial establishments, houses, etc.
The system comprises a monitoring system and several sensing zones. Each sensing zone is provided with a closed-loop switch known as sense switch. Sense switches are fixed on the doors of premises under security and connected to the monitoring system. As long as the doors are closed, sense switches are also closed. The monitoring system can be installed at a
convenient central place for easy operation. |
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LASER TORCH-BASED VOICE TRANSMITTER AND RECEIVER
from Santosh 18/03/2010 11:15 |
Downloads: 311
Comments: 1 |
| Using this circuit you can communicate with your neighbours wirelessly. Instead of RF signals, light from a laser torch is used as the carrier in the circuit. The laser torch can transmit light up to a distance of about 500 metres. The phototransistor of the receiver must be accurately oriented towards the laser beam from the torch. If there is any obstruction in the path of the laser beam, no sound will be heard from the receiver. |
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PC-based DC Moter Speed Controller
from Santosh 18/03/2010 11:11 |
Downloads: 97
Comments: 0 |
| This circuit allows you to control the speed of a DC motor (in eight levels) from your PC’s parallel port. The PC uses a software program to control the speed of the motor. |
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Led based Message Display
from Santosh 18/03/2010 11:05 |
Downloads: 135
Comments: 0 |
This LED-based message display is built around readily available, low cost components. It is easy to fabricate and makes use of 3mm red LEDs. A total of 172 LEDs have been arranged to display the message “HAPPY NEW YEAR 2004.”
PDF description and CKT diagram. |
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Binary to 7 Segment Decoder
from Santosh 12/03/2010 11:05 |
Downloads: 17
Comments: 0 |
| This circuit displays the Hexadecimal equivalent of a 4 bit Binary Number. The number is displayed on a 7 Segment LED display. There are many Binary to 7 Segment decoders out there, such as the CD4511, DM74LS47, SN7447 and the DM9368. All of which have attractive features, but none have all of them in one package. Another downside is many only display 0 - 9 with few displaying all Hexadecimal digits (0 - F). With many of these chips obsolete and hard to find, my Binary to 7 Segment Decoder is a versatile substiute. |
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Lessons In Electric Circuits [Volume V - Reference]
from BlackMASK 20/11/2009 12:46 |
Downloads: 117
Comments: 0 |
Copyright (C) 2000-2007, Tony R. Kuphaldt
Content of Book:
1. Master Index
2. Chapter 1: USEFUL EQUATIONS AND CONVERSION FACTORS
3. Chapter 2: RESISTOR COLOR CODES
4. Chapter 3: CONDUCTOR AND INSULATOR TABLES
5. Chapter 4: ALGEBRA REFERENCE
6. Chapter 5: TRIGONOMETRY REFERENCE
7. Chapter 6: CALCULUS REFERENCE
8. Chapter 7: USING THE SPICE CIRCUIT SIMULATION PROGRAM
9. Chapter 8: TROUBLESHOOTING -- THEORY AND PRACTICE
10. Chapter 9: CIRCUIT SCHEMATIC SYMBOLS
11. Chapter 10: PERIODIC TABLE OF THE ELEMENTS
12. Appendix 1: ABOUT THIS BOOK
13. Appendix 2: CONTRIBUTOR LIST
14. Appendix 3: DESIGN SCIENCE LICENSE
This document is distributed under http://www.ibibli...l/dsl.html
Copyright © 1999-2000 Michael Stutz stutz@dsl.org
Verbatim copying of this document is permitted, in any medium. |
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Lessons In Electric Circuits [Volume VI - Experiments]
from BlackMASK 20/11/2009 12:34 |
Downloads: 189
Comments: 0 |
Copyright (C) 2000-2007, Tony R. Kuphaldt
Content of Book:
1. Master Index
2. Chapter 1: INTRODUCTION
3. Chapter 2: BASIC CONCEPTS AND TEST EQUIPMENT
4. Chapter 3: DC CIRCUITS
5. Chapter 4: AC CIRCUITS
6. Chapter 5: DISCRETE SEMICONDUCTOR CIRCUITS
7. Chapter 6: ANALOG INTEGRATED CIRCUITS
8. Chapter 7: DIGITAL INTEGRATED CIRCUITS
9. Appendix 1: ABOUT THIS BOOK
10. Appendix 2: CONTRIBUTOR LIST
11. Appendix 3: DESIGN SCIENCE LICENSE
This document is distributed under DESIGN SCIENCE LICENSE
Copyright © 1999-2000 Michael Stutz stutz@dsl.org
Verbatim copying of this document is permitted, in any medium. |
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