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Friday, April 23, 2010
Window Tips and Tricks & Hacks
Website dedicated to technology news, Internet, tutorials, tweaks, tips-n-tricks, software reviews, themes, skins, wallpapers, icons, troubleshooting guides ...
Friday, April 16, 2010
Tuesday, April 13, 2010
Full Web Building Tutorials
At W3Schools, you can study everything you need to learn, in an accessible and handy format.
"Never increase, beyond what is necessary, the number of words required to explain anything"
William of Ockham (1285-1349)
"Never increase, beyond what is necessary, the number of words required to explain anything"
William of Ockham (1285-1349)
Saturday, April 10, 2010
Thursday, April 8, 2010
Electronics For You...Electronic Circuits for Beginners
EFY Magonline, Electronics projects/ portals/ portal, free website submissions, e magazines, e-mags, Test Measurement, Power Supply offered by us.
Wednesday, April 7, 2010
Simple Mobile Phone Jammer using 555
Description
A “Cell Jammer” is just way of saying “Dirty Transmitter” which happens to transmit within the Cellular Phone Bands. Reality is, the dirtier the better.
The 555 timer [8 pin] IC simply makes a noise. It’s coupled via C4 [electrolytic] to modulate the MRF transistor oscillator. With C1 set at roughly 1/3rd, you will be close to 900 MHz. By sweeping the C1 trimmer capacitor, you can swing the output frequency from 800 MHz to 2 GHz with the transistor and values shown.
You could replace the 555 chip with an electret microphone and listen to yourself talk on a scanner, so the unit could easily couple as a UHF Bug.
Instead of a single Tapped Coil, I’ve used two molded inductors for ease of construction.Values for C1,C2,L1,L2 are critical for the frequency range.
You might want to build the unit into a metal box, add an on/off switch in the batteries + line, and maybe even add a LED. Connect an old 800 MHz cell phone antenna to C5.
Would you believe the whole thing can be built on top of the 555 IC itself when using surface mount components, and the lot will fit onto a nine volt battery clip. Output is reasonably good, although the current drain is a bit high, so a new 9 Volt battery will only run about an hour, [if you are lucky].
The “Cell Kill Distance” is around 10 – 15 feet, ample for most purposes.
A “Cell Jammer” is just way of saying “Dirty Transmitter” which happens to transmit within the Cellular Phone Bands. Reality is, the dirtier the better.
The 555 timer [8 pin] IC simply makes a noise. It’s coupled via C4 [electrolytic] to modulate the MRF transistor oscillator. With C1 set at roughly 1/3rd, you will be close to 900 MHz. By sweeping the C1 trimmer capacitor, you can swing the output frequency from 800 MHz to 2 GHz with the transistor and values shown.
You could replace the 555 chip with an electret microphone and listen to yourself talk on a scanner, so the unit could easily couple as a UHF Bug.
Instead of a single Tapped Coil, I’ve used two molded inductors for ease of construction.Values for C1,C2,L1,L2 are critical for the frequency range.
You might want to build the unit into a metal box, add an on/off switch in the batteries + line, and maybe even add a LED. Connect an old 800 MHz cell phone antenna to C5.
Would you believe the whole thing can be built on top of the 555 IC itself when using surface mount components, and the lot will fit onto a nine volt battery clip. Output is reasonably good, although the current drain is a bit high, so a new 9 Volt battery will only run about an hour, [if you are lucky].
The “Cell Kill Distance” is around 10 – 15 feet, ample for most purposes.
Tuesday, April 6, 2010
Free Mobile Applications
Directory and download service of mobile Java games and applications by independent developers.
Monday, April 5, 2010
Welcome in the World of Electronics
This site is designed for the struggling students of Engineering. You can get any kind of help here, this site has many professionals to help and guide you.
Very Useful Site of Electronics Projects
Electronic Circuits · Schematic Symbol Reference · How To Solder · How To Desolder · Building Tips · Electronics Calculators.
AT89Sxx Cheap and Simple Learning Board
Build your own a cheap simple Microcontroller learning board S-52. The board is based on ATMEL's new ISP chip AT89S51, AT89S52, or AT89S53. This board can be used by beginners for learning Assembly and C language programming. Single sided PCB file included.
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