Showing posts with label the. Show all posts
Showing posts with label the. Show all posts
Sunday, December 22, 2013
It is the function and feature of cell phone jammer
It is the function and feature of cell phone jammer .
Then the order of execution of its boot program data read from external memory (font, chip). If not read the information at this time, the CPU internal reset (via the CPU internal "watchdog" or
hardware reset command) bootloader If successful completion of implementation, the CPU was taken from the external font program execution, if acquisition procedures are abnormal, it can lead to a
"watchdog" to reset both the program and from address start. The CPU reads the character through the parallel data and address lines and address lines, together with the read and write control
clock line W / R, some readers may ask, font is how to distinguish between the program read, or read the data? Microcontroller with external program memory chip select signal line or the CS, CE,
and the W / R role, you can allow the character to distinguish between read data or program. Install the main machine of cell phone jammer first.
Phone all the software work processes are carried out under the action of the CPU, the specific division of the five processes described below. These processes are software in the form of data
storage in the phone in EEPROM and FLASHROM of when the phones power supply module detects a power key is pressed, the cell phone battery voltage is converted to a voltage suitable for the use of
the phone circuit value supplied to the power module, the clock circuit supply voltage oscillation signal into the logic circuit, CPU voltage and clock signal, performs the boot process, the first
read from the ROM boot code execution logic The self-test of the system. And all of the reset signal is set high, if the self-test through. cell phone jammer will only act on cell phone
communication.
The CPU is given Watchdog (Watchdog) signal to the module, then the power supply module in the role of watchdog (Watchdog) signal to maintain the boot. Phone is switched on, not only search for the
broadcast control signal Road (BCCH) carrier frequency. Because the system at any time be sent to each user in the community users to broadcast control information. Phone to collect the search to
the strongest (BCCH) carrier frequency. The carrier frequency corresponding to the read frequency correction channel (FCCH), frequency and synchronization of the mobile phone (MS). Each users
mobile phone in different morning (both residential) carrier frequency is fixed, it is to determine when the network by the GSM network operator, rather than determined by the users GSM phone.
Mobile phones to read the sync channel. It is 1 set of main machine of cell phone jammer .
More...
Then the order of execution of its boot program data read from external memory (font, chip). If not read the information at this time, the CPU internal reset (via the CPU internal "watchdog" or
hardware reset command) bootloader If successful completion of implementation, the CPU was taken from the external font program execution, if acquisition procedures are abnormal, it can lead to a
"watchdog" to reset both the program and from address start. The CPU reads the character through the parallel data and address lines and address lines, together with the read and write control
clock line W / R, some readers may ask, font is how to distinguish between the program read, or read the data? Microcontroller with external program memory chip select signal line or the CS, CE,
and the W / R role, you can allow the character to distinguish between read data or program. Install the main machine of cell phone jammer first.
Phone all the software work processes are carried out under the action of the CPU, the specific division of the five processes described below. These processes are software in the form of data
storage in the phone in EEPROM and FLASHROM of when the phones power supply module detects a power key is pressed, the cell phone battery voltage is converted to a voltage suitable for the use of
the phone circuit value supplied to the power module, the clock circuit supply voltage oscillation signal into the logic circuit, CPU voltage and clock signal, performs the boot process, the first
read from the ROM boot code execution logic The self-test of the system. And all of the reset signal is set high, if the self-test through. cell phone jammer will only act on cell phone
communication.
The CPU is given Watchdog (Watchdog) signal to the module, then the power supply module in the role of watchdog (Watchdog) signal to maintain the boot. Phone is switched on, not only search for the
broadcast control signal Road (BCCH) carrier frequency. Because the system at any time be sent to each user in the community users to broadcast control information. Phone to collect the search to
the strongest (BCCH) carrier frequency. The carrier frequency corresponding to the read frequency correction channel (FCCH), frequency and synchronization of the mobile phone (MS). Each users
mobile phone in different morning (both residential) carrier frequency is fixed, it is to determine when the network by the GSM network operator, rather than determined by the users GSM phone.
Mobile phones to read the sync channel. It is 1 set of main machine of cell phone jammer .
Tuesday, March 12, 2013
Make a Workbench Multimeter With the IC 741
Testing and troubleshooting electronic project circuits requires a multimeter, so why not make the circuit of a homemade multimeter itself as your next electronic project. Interesting homemade circuits like an Ohmmeter, voltmeter, ammeter are discussed here using the IC 741 and just a few other passive components.
Although multimeters are available plentifully in the market today, but building your own homemade multimeter can be real fun. Moreover the attributes involved can become thoroughly useful for the future electronic circuit building and testing procedures.
Circuit Illustrations
A simple configuration for measuring DC voltages is shown below using the IC 741. A couple of resistors Rx and Ry are introduced at the input in a potential divider mode at the non-inverting pin #3 of the IC. The voltage to be measured is applied across the resistor R1 and ground. Through proper selection of Rx and Ry, the range of the meter can be varied and different voltages can be measured.
In case you want to measure alternating voltages then the circuit illustrated below can become useful. The wiring is similar to the above wiring, however the positions of Rx and Ry have changed and also a coupling capacitor comes into the scene at the inverting input of the IC. Interestingly the meter here is now connected across a bridge network enabling the meter to display the relevant AC potentials correctly.
Another circuit to measure Direct current or Amps using the IC 741 is shown below. The configuration looks pretty simple. Here the input is applied across the resistor Rz i.e. across the non-inverting input pin #3 of the IC and the ground. The range of the meter can be simply varied by changing the value of the resistor Rz.
Resistors are one of the most important passive components which inevitably become an integral part of every electronic circuit. A circuit may be virtually impossible to build without accompanying these amazing current controlling devices. With so many resistors involved, a possible fault can always be on the cards. Identifying them requires a meter – an Ohm meter. A simple design using the IC 741 is shown below just for the purpose.
Unlike most of the analogue designs which tend to have a rather non-linear behavior, the present design very efficiently tackles the problem to produce a perfectly linear response with the corresponding measurements. The range is pretty impressive, it can measure values of resistors right from 1K up to a staggering 10 M. You may go on to modify the circuit for enabling the measurement of more extreme values.
The range is selected by moving the rotary switch switch into the relevant positions. Calibreating th instrument is simple and is done with the following points:
Adjust the selector switch to the “10K” position.
Trim the base preset of the transistor until its emitter voltage shows exactly 1 volt (measure using a digital multimeter.)
Next, Fix an accurately known 10 K resistor into the measuring slot.
Adjust the trimmer associated with the moving coil meter until the meter shows a full scale deflection.
All the circuits discussed above use dual supply voltages. The meter used is a moving coil type and is specified as 1mA FSD.
The preset across the pins 1, 4 and 5 of the IC 741 used for this homemede multimeter is used for adjusting the initial condition meter to exactly zero.
Relevant Values of Rx and Ry
The following are the values of the resistors required for varying the range of the respective meters.
DC Voltmeter
Rx--------------------Ry--------------------Meter FSD
10M-----------------1K--------------------1 KV
10M-----------------10K-------------------100V
10M-----------------100K------------------10V
900K----------------100K------------------1V
NIL-------------------100K-----------------0.1V
DC AMMETER
Rz--------------------Meter FSD
0.1-------------------1A
1---------------------100mA
10-------------------10mA
100-----------------1mA
1K-------------------100uA
10K-----------------10uA
100K---------------1uA
AC VOLTMETER
Ry---------------------Rx-------------------Meter FSD
10K-------------------10M----------------1KV
100K-----------------10M----------------100V
1M-------------------10M-----------------10V
1M--------------------1M------------------1V
1M--------------------100K----------------100mV
1M--------------------10K------------------10mV
1M--------------------1K--------------------1mV
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