Circuit electrinic

 1900~1990MHz is also contained in the working frequency of cell phone jammer .
Brand and customer base better. Earlier from the Chinese network is one of the manufacturers to enter online, through continuous development, has formed a good brand and user base. As of the end of March 2009, page views from the Chinese network has reached 300 million times / day. In addition, from the Chinese networks literature as a grand site, as Shanda comprehensive line of wireless entertainment business, one in human resources, product integration operations (such as the original literature into online games, etc.) also has a large advantage . Chinese online (www.ChineseAll.com) was established in 2000 at Tsinghua University, is one of Chinas Internet publishing pioneer, leading to the most legitimate digital content broadcaster. At present, the Chinese online products or services related to educational institutions, government agencies, public consumption, in various market development in a leading position.
Chinese online product content, copyright and other aspects of operations and customer base are more advantages, mainly in the following points: rich, extensive resources: Chinese online digital rights in China earlier one operating company, has accumulated a rich content resources, in addition to the Internet with the original literature, but also a broad range of primary and secondary education for users, courseware and other content resources, and have literature classes, art classes, childrens class, economics and management, integrated classes, education classes, lifestyle, tools and other literary works. This type of cell phone jammer can work as long as the antenna is collectively connected and the power supply is switched on.
Resources are more extensive content partners: Chinese online now with publishers, writers, original site, the book established the upper range of content partnerships, at present, with more than 400 publishers, more than 8,000 well-known writer, mo re than 20,000 Web authors to cooperate. On the Internet, wireless Internet has a wealth of content operations experience, reading the users structure, needs, content management and control have a deep understanding. Operating experience and extensive collaboration with government departments: Currently, the Chinese already have Monternet online, mobile own business experience of cooperation, the Chinese telecom operators have a wealth of management experience working system.

Here is a tester for on-board testing of IR receiver modules used for remote control of TV sets and VCD players. The circuit is very simple and can also function as a remote tester. IR receiver modules are miniature IR receivers sensitive to pulsed infrared rays. These have a pin photo-diode and a preamplifier stage encased in an epoxy case that acts as the IR filter.

Infrared (IR) Receiver Module Tester Circuit Diagram

Internally, the module has an AGC, band-pass filter, demodulator and control circuit. Its output has a bipolar transistor with 80- to 100-kilo-ohm resistor in the collector. Normally, the collector output of the transistor is high and gives 5V at 5 mA. The output of the module is active-low and hence it sinks current when the pin photo-diode senses the presence of pulsed IR rays.


The IR receiver module is designed with high immunity against ambient light and is capable of continuous data transmission at up to 2400 bps or higher. The band-pass filter and AGC suppress unexpected noise to avoid false triggering. The module responds to the IR beam only if its carrier frequency is close to the centre frequency of the band pass.

IR Receiver Module Pinout

Working of the circuit is simple. Three mini crocodile clips are used to connect the circuit to the positive, negative and output of the module. If the module is properly working, its output remains 5 volts. This makes the cathode of LED1 high. So LED1 doesn’t glow and the buzzer remains silent. When you focus the remote handset onto the IR receiver and press any switch, the output of the IR receiver sinks current.

So LED1 starts flashing and the buzzer beeps in sync with the pulsations of the IR beam. On the other hand, if your IR receiver module is faulty, the output of the module does not sink current when you focus the remote handset towards the module and press any switch. So neither LED1 flashes, nor the buzzer beeps in sync with the pulsations of the IR beam.

Power to the circuit is obtained from a 9V PP3 battery and regulated to 5 volts by zener diode ZD1. Most of the IR receiver modules work only between 3 and 6 volts. Storage capacitor C1 releases current to make LED1 flash brightly. (EFY Note. We had used a TSOP1738 IR receiver module while testing. Fig. 2 shows the pin configuration of TSOP1738.)

Assemble the circuit on a small piece of matrix board and enclose in a small cabinet. Use a high-brightness red LED and a small buzzer for audio-visual indication. Connect points A, B and C to the crocodile clips using red, black and blue wires to connect to the pins of the module easily. For easy identification of pins, the pin assignment (front view) of some common IR receiver modules is shown in the table.

 It also has a special mode for pictures of contacts and a World Card Mobile application

for capturing and reading business cards.
Videos can be captured in normal and MMS modes. Format options include MPEG4 and H.263. Highest resolution can be set at VGA (640x480 pixels). Recording limit has a number of options such as 10

seconds, 3 minutes, 2 MB, etc.This is a gadget which can add extra capability to your cellular phone. A cell phone booster with

a Bluetooth contrivance can set up a wireless connection with some other detailed devices with the same capability. Hence, it abolishes the requirement to use physical cables.This accessory help

you in providing the strong network along with the huge connectivity. Antenna Booster will help you in many ways. It provides the good connection so that you can easily talk to your relatives or

family members.Faceplates are generally used to give the trendy, classy, amazing, stylish, and the glossy look to your touchtone phones. They are available in the market in great abundance. You can

get them according to your need and make your cell also luxurious.
This is all about the accessories and its benefits, I hope after reading this article you will surely purchase the good and the stylish accessories for your handsets.
 Schools are looking to purchase mobile phone signal boosters. The misuse of cell phone boosters during class is causing the teachers to fight back. Not only is it a huge distraction during class

while teachers are trying to actually teach, but there is also concern that cheating is more prevalent with the ongoing texting.
In Des Moines, Iowa, one school board member was quoted by the Des Moines Record. "I dont think they have a place in the educational environment. The educational environment is supposed to be

about students learning and teachers teaching and teachers cant teach over a mobile phone. If a student is busy on the cell phone booster they arent learning. Its a distraction... and we need to

minimize the distraction."
What is the solution? With the FCC controlling signal boosters as well as signal boosters, and the law limiting signal boosters to use only by federal authorities, schools dont have much of a

chance to fight back that way.
One reader responded to the article in the Des Moines Register with an amusing suggestion to the problem. "Oh, For Crying-out-load. Just hang one of those shoe organizers next to the door and

require each student to check in their phones on entering the classroom, then they can retrieve them after class.