Diagram Diagosis

Showing posts with label cell. Show all posts

Friday, December 20, 2013

Cell Phone Jammers has no radiation towards the human body

Cell Phone Jammers has no radiation towards the human body.
Although almost all manufacturers have in recent years tend to use lithium-ion battery, but the worlds major mobile phone manufacturers the choice of battery or have their own characteristics and habits, such as once in the same historical period: Nokia: The Ni- MH (nickel-metal hydride) battery, LiB (liquid lithium-ion) batteries, not the use of LiP (polymer lithium-ion) batteries. Ericsson: The Ni-MH battery, LiB battery, LiP batteries. Motorola: The Ni-MH battery, LiB battery, did not use LiP batteries. Not difficult to find, from the earliest use of mobile phones LiP polymer lithium-ion batteries on this matter, Ericsson reflect the true nature of their cell phone technology pioneer. According to the information I find that, at present polymer lithium-ion battery factory in Japan SONY, Panasonic, GS, several companies, produced in 2000 reached 21 million, of which 50% of Ericsson mobile phone support.
This environment is very noisy radio environments, it is even more obvious advantages. Another advantage of Bluetooth technology is that it applies globally consistent set of frequencies, which eliminates the "border" barriers, while in the field of cellular mobile phones, this obstacle has been plagued users for many years. In addition, ISM band radio system for all the bands are open, so use one of these bands will encounter unpredictable sources of interference. For example, some appliances, cordless phones, car room door openers, microwave ovens, etc., are likely to be interference. The inspection report of Cell Phone Jammers needs the signature of the director of Cell Phone Jammers workshop.
To this end, the Bluetooth technology, especially designed to quickly identify and frequency hopping scheme to ensure that the link stability. Band frequency hopping is to be divided into a number of hopping channels (hop channel), in a single connection, the radio transceiver according to a certain code sequence constantly jump from one channel to another channel, only the sender and receiver to communicate is based on the law , and other interference can not be carried out by the same laws of interference; hopping the instantaneous bandwidth is very narrow, but through spread spectrum technology make this expansion into narrowband or broadband multiply, so that interference effects may become very small. Work with other systems compared to the same frequency band, Bluetooth frequency hopping faster, shorter packets, which makes Bluetooth technology are more stable than other systems. Chipset mainly refers to the Bluetooth headset Bluetooth chips used in the design of the composition. Bluetooth chip on the market today many manufacturers. Major telecommunications manufacturers have designed in accordance with Bluetooth standards have different chipsets. The factory inspection and acceptance personnel should sign the report of Cell Phone Jammers if Cell Phone Jammers is qualified.

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Saturday, August 3, 2013

Simple Cell Phone Jammer Circuit Diagram 2

A beautiful diy gsm jammer or mobile cell phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 mobile phone network is used by USA, Canada and most of the countries in South America.

This cell phone jammier is not applicable for use in Europe, Middle East, nor Asia. The GSM jammier circuit could block mobile phone signals which works on GSM1900 band, also called DCS. For more cell phone jammers check the related posts.

Mobile cellphone jammer circuit diagram

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Friday, May 17, 2013

2 Cell Lithium Ion Charger

This circuit was body to allegation a brace alternation Lithium beef (3.6 volts each, 1 Amp Hour capacity) installed in a carriageable transistor radio.

The charger operates by bartering a abbreviate accepted beating through a alternation resistor and again ecology the array voltage to actuate if addition beating is required. The accepted can be adapted by alteration the alternation resistor or adjusting the ascribe voltage. Back the array is low, the accepted pulses are spaced abutting calm so that a somewhat connected accepted is present. As the batteries ability abounding charge, the pulses are spaced further afar and the abounding allegation action is adumbrated by the LED blinking at a slower rate.

A TL431, bandage gap voltage advertence (2.5 volts) is acclimated on pin 6 of the comparator so that the comparator achievement will about-face low, triggering the 555 timer back the voltage at pin 7 is beneath than 2.5 volts. The 555 achievement turns on the 2 transistors and the batteries allegation for about 30 milliseconds. Back the allegation beating ends, the array voltage is abstinent and disconnected bottomward by the aggregate 20K, 8.2K and 620 ohm resistors so that back the array voltage alcove 8.2 volts, the ascribe at pin 7 of the comparator will acceleration hardly aloft 2.5 volts and the ambit will stop charging.

The ambit could be acclimated to allegation added types of batteries such as Ni-Cad, NiMh or advance acid, but the shut-off voltage will allegation to be adapted by alteration the 8.2K and 620 ohm resistors so that the ascribe to the comparator charcoal at 2.5 volts back the terminal array voltage is reached.

For example, to allegation a 6 volt advance acerbic array to a absolute of 7 volts, the accepted through the 20K resistor will be (7-2.5)/ 20K = 225 microamps. This agency the aggregate of the added 2 resistors (8.2K and 620) charge be R=E/I = 2.5/ 225 uA = 11,111 ohms. But this is not a accepted value, so you could use a 10K in alternation with a 1.1K, or some added ethics that absolute 11.11K

Be accurate not to blackmail the batteries. I would acclaim application a ample capacitor in abode of the array to analysis the ambit and verify it shuts off at the actual voltage.

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Sunday, April 7, 2013

How to Build a Cell Phone Controlled Door Latch

Posted by hitman

Controlling your door lock through your personal cell phone was never this easy. Learn how to build a simple electronic circuit that will help in converting your ordinary door lock into a high security door lock which can be now controlled through your own cell phone.

Your ordinary door lock can be now very easily converted into a cell phone controlled high security door lock. Learn the entire building procedure through some simple instructions and circuit schematics.

Introduction

A very simple configuration using a low cost cell phone (used as a modem) and an electronic circuit can be build to control remotely a high security door lock. Once the unit is built and attached to a door, by simply assigning your personal cell phone’s number inside the modem cell phone, you can alternately lock and unlock a particular door by sending subsequent “miss calls” through your cell phone to it from any part of the world. We use a NOKIA 1202 as the modem cell phone here for the project. Let’s proceed and learn the simple instructions required to complete the project.

How the Circuit Functions?

The basic concept of the project is to detect a particular ringtone from a SIM supporting modem and use it to toggle the electronic circuit and the load (door lock) correspondingly. The very specific and unique ringtone – “Beep Once” or the “No Tone” is available with every NOKIA cell phone. And also this ring can be assigned to any particular fed number of the cell phone. So this ringtone becomes specific only to that particular number and will be sounded every time a call is received from the assigned number. This facility has been ideally exploited here. A 5 volt regulated supply is used to trickle charge the modem round the clock so that its battery is never discharged. This supply also goes to the IC 4093 = pin 14 (+) and pin 7(-). An in-built cut-off system inside every NOKIA cell phone ensures a safe charging.

The circuit functioning may be easily understood with the following explanation.

The FIGURE above shows a simple three transistor amplifier circuit which is basically used as a tone amplifier. On receiving a “miss call” from the assigned number (owner’s cell phone), the modem immediately responds and produces the desired ringtone (“Beep Once”). This tone frequency is collected from the modem’s headphone socket and applied to the tone amplifier’s input. The ringtone is suitably amplified and is used to toggle a relay momentarily. This relay connects a 5 volt trigger pulse to the input of CMOS flip flop circuit and also sounds a buzzer. The flip flop toggles in response to the above action and activates the following transistor/relay locking mechanism. A car central lock has been effectively integrated with an ordinary manual locking shaft to form an excellent door dead bolt. The whole system activates in a push pull manner to alternately lock and unlock the door in response to every subsequent “miss call” from the owner’s cell phone.

Assembled, tested kit available, contact hitman2008@live.in

Parts List

R1=2K7

R2=10K

R3=10K

R4=2M2

R5=2M2

R6=1K

R7=1M

R8= 180 Ohms

R91K

R10=10K

R11=22k

R12=47K

R13=10 Ohm

C1,C2=470uF/25V

C3,C4,C5=0.22uF

C6,C7,C12=10uF/25V

C8 = 0.1uF/100V

C9,C10=1uF/25V

C11=1000uF/25V

All NPN Transistors are BC547 and PNP is BC557

IC2=7805

IC1=4093

All Relays=12V/400 Ohm

Diodes D5- D8=1N5408

Rest all Diodes are 1n4148

Transformer=0-12V/3Amp

Construction Clues and Modem Cell Phone Configuration

Constructing the control circuit is very easy and may be done by just assembling the procured electronic components over a general purpose board by soldering. All the connections should be accurately done with the help of the given circuit schematic. Once the assembly is completed, it’s time to configure the modem cell phone.

The attached modem cell phone needs to be set up through the following steps:

Go to settings and select set the default ringtone as EMPTY. It means now at this position the modem does not produce any ringtone to any incoming calls. Also, switch off the message tone, keypad tone, start up tone etc.

Now feed your personal cell phone numbers (single or many as desired) through which the modem and the lock need to be operated.

Assign the required “beep once” ringtone to all these numbers.

The modem is all set. Integrate it to the control circuit through its headphone socket pin assembly. Also, connect the charging voltage input to it as shown in the diagram.

Your high security door lock is fully ready and can be installed over the door which is to be controlled and will lock and unlock it faithfully on receiving the subsequent “miss calls” from the assigned numbers.

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