Showing posts with label the. Show all posts
Showing posts with label the. Show all posts
Saturday, December 21, 2013
The signal jammer is what increases the signal
The external directional antenna is designed to pick up the weak signal that is being broadcast by your cellular provider.
The signal the external antenna picks up is sent over wires to the signal jammer. The signal jammer is what increases the signal. Your boosted signal is then sent to the internal antenna which wirelessly rebroadcasts a more powerful signal within your space.
Cell blocker operate on different frequencies: 800 MHz, 1900 MHz and iDEN. The 800MHz frequency is compatible with Verizon phones outside of Florida and Texas, Alltel phones in selected states, and US Cellular phones in selected states. T-mobile, Sprint, Metro PCS and several other carries operate on the 1900MHz band. AT&T operates on both bands.
Often the most comprehensive solution is to opt for a Dual Band Cellular jammer. These blocker operate on both the 800 MHz and 1900 MHz bands, ensuring proper coverage with all major carriers. Nextel users in need of a cellular jammer must invest in an iDEN jammer.
Whether you need to amplify cellular signals in a large home, small apartment, warehouse or car, there are cell blocker that are designed for your needs. The following blocker are extremely popular in the cell jammer space and represent some of the different applications for cellular blocker.
One of the most popular cell jammer kits on the market, the YX545 Cellular jammer Kit is dual band, making it compatible with all cell phone carriers except Nextel. This cell jammer can amplify cellular signals in an area of 2,500-3,000 square feet with a 60dB gain, making it ideal for small home and office settings. The YX545 kit features everything you need for set-up and installation, including all the necessary cables and antennae.
The 841262 Dual Band jammer from Wilson Electronics is comparable to the YX545. However, this model amplifies cellular signals up to 5,000 square feet with a slightly higher 62 dB gain. Thus the Wilson 841262 is optimal for application in medium-to-large offices or homes. The standard external antenna, jammer and internal antenna setup applies.
The Wilson Sleek is a unique cell jammer in that it doesnt include a visible internal antenna or a separate jammer component. Designed for use while on-the-go, this cell jammer from Wilson Electronics is simply a cell phone cradle that has an internal antenna built right in.
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The signal the external antenna picks up is sent over wires to the signal jammer. The signal jammer is what increases the signal. Your boosted signal is then sent to the internal antenna which wirelessly rebroadcasts a more powerful signal within your space.
Cell blocker operate on different frequencies: 800 MHz, 1900 MHz and iDEN. The 800MHz frequency is compatible with Verizon phones outside of Florida and Texas, Alltel phones in selected states, and US Cellular phones in selected states. T-mobile, Sprint, Metro PCS and several other carries operate on the 1900MHz band. AT&T operates on both bands.
Often the most comprehensive solution is to opt for a Dual Band Cellular jammer. These blocker operate on both the 800 MHz and 1900 MHz bands, ensuring proper coverage with all major carriers. Nextel users in need of a cellular jammer must invest in an iDEN jammer.
Whether you need to amplify cellular signals in a large home, small apartment, warehouse or car, there are cell blocker that are designed for your needs. The following blocker are extremely popular in the cell jammer space and represent some of the different applications for cellular blocker.
One of the most popular cell jammer kits on the market, the YX545 Cellular jammer Kit is dual band, making it compatible with all cell phone carriers except Nextel. This cell jammer can amplify cellular signals in an area of 2,500-3,000 square feet with a 60dB gain, making it ideal for small home and office settings. The YX545 kit features everything you need for set-up and installation, including all the necessary cables and antennae.
The 841262 Dual Band jammer from Wilson Electronics is comparable to the YX545. However, this model amplifies cellular signals up to 5,000 square feet with a slightly higher 62 dB gain. Thus the Wilson 841262 is optimal for application in medium-to-large offices or homes. The standard external antenna, jammer and internal antenna setup applies.
The Wilson Sleek is a unique cell jammer in that it doesnt include a visible internal antenna or a separate jammer component. Designed for use while on-the-go, this cell jammer from Wilson Electronics is simply a cell phone cradle that has an internal antenna built right in.
Saturday, September 28, 2013
The Gentle Touch Circuit Diagram
Consumer appliances these days hardly ever have a proper mains switch. Instead, appliances are turned on and off at the touch of a button on the remote control, just like any other function. This circuit shows how a device (as long as it does not draw too high a current) can be switched on and off using a pushbutton. The approach requires that a microcontroller is already available in the circuit, and a spare input port pin and a spare output port pin are required, along with a little software. When power is applied T1 initially remains turned off. When the button is pressed the gate of T1 is taken to ground and the p-channel power MOSFET conducts. The microcontroller circuit is now supplied with power. Within a short period the microcontroller must take output PB1 high. This turns on n-channel MOSFET T1 which in turn keeps T1 turned on after the push-button is released.
Now the microcontroller must poll the state of the push-button on its input port (PB0) at regular intervals. Immediately after switch-on it will detect that the button is pressed (a low level on the input port pin), and it must wait for the button to be released. When the button is next pressed the device must switch itself of f: to do this the firmware running in the microcontroller must set the output port pin to a low level. When the button is subsequently released T1 will now turn off and the supply voltage will be removed from the circuit.
The circuit itself draws no current in the off state, and for (rechargeable) battery-powered appliances it is therefore best to put the switch before the voltage regulator. For mains-powered devices the switch can also be fitted before the voltage regulator (after the rectifier and smoothing capacitor). Since there is no mains switch there will still be a small standby current draw in this case due to the transformer. Be careful not to exceed the maximum gate-source voltage specification for T1: the IRFD9024 device suggested can withstand up to 20 V. At lower voltages R2 can be replaced by a wire link; otherwise suitable values for the voltage divider formed by R1 and R2 must be selected.
Circuit diagram:
The Gentle Touch Circuit Diagram
The author has set up a small website for this project at http://reweb.fh-weingarten.de/elektor, which gives source code examples (which include dealing with pushbutton contact bounce) for AVR microcontrollers suitable for use with AVR Studio and GNU C. Downloads are also available at http://www.elektor.com.
Rainer Reusch - Elektor Electronics 2008
Sunday, April 21, 2013
Real Time Clock Using the PIC16CXXX
A very simple real time clock electronic project can be designed using the PIC16CXXX microcontroller family , designed by Microchip Technology . This real time clock electronic project uses the Timer1 module, from a mid-range PIC16CXXX microcontroller, to control a low-power real-time clock. Timer1 was chosen because it has its own crystal which allows the module to operate during sleep.
Upon power-up, the device is initialized with the display starting at 12:00 PM, and Timer1 is configured to generate an interrupt (every second). The Timer1 overflow interrupt wakes the device from sleep. This causes the time registers (HRS, MIN, SECS) to be updated. If the SECS register contains an even value (SECS<0> = 0), the colon (":") is not displayed. This gives a visual indication for each second. Then the device returns to sleep.
Real Time Clock Circuit Diagram
Upon power-up, the device is initialized with the display starting at 12:00 PM, and Timer1 is configured to generate an interrupt (every second). The Timer1 overflow interrupt wakes the device from sleep. This causes the time registers (HRS, MIN, SECS) to be updated. If the SECS register contains an even value (SECS<0> = 0), the colon (":") is not displayed. This gives a visual indication for each second. Then the device returns to sleep.
Real Time Clock Circuit Diagram
For setting the clock are used three keys : SELECT_UNITS Key (S1) selects which units are to be modified (hours, minutes, off), the INC Key (S2) increments the selected units and CLR_MIN Key (S3) clears the minutes and seconds (useful for exactly setting the time ) .
This simplify design use a standard Hitachi LCD display module and some other electronic parts .
The RA2:RA0 pins are the control signals to the LCD display, RB3:RB0 acts as a 4-bit data bus, and RB7:RB5 are the input switches. The OSC1 pin is connected to an RC network, which generates an approximate 4 MHz device frequency. Because Timer1 operates asynchronously to the device, the devices oscillator can be configured for RC mode.
Timer1’s crystal is connected to the T1OSI and T1OSO pins. A good choice for a crystal is a 32.786 kHz (watch) crystal.
This electronic project and source code was designed by Mark Palmer Microchip Technology Inc.
This simplify design use a standard Hitachi LCD display module and some other electronic parts .
The RA2:RA0 pins are the control signals to the LCD display, RB3:RB0 acts as a 4-bit data bus, and RB7:RB5 are the input switches. The OSC1 pin is connected to an RC network, which generates an approximate 4 MHz device frequency. Because Timer1 operates asynchronously to the device, the devices oscillator can be configured for RC mode.
Timer1’s crystal is connected to the T1OSI and T1OSO pins. A good choice for a crystal is a 32.786 kHz (watch) crystal.
This electronic project and source code was designed by Mark Palmer Microchip Technology Inc.
Monday, April 8, 2013
How to choose the best for your home theater system
Watching movies is a neat escape from the stressful lifestyle we live in. Watching movies in a wide screen and surround sound take you far away and into the movie scene you are watching. You watch it as if you were there in the movie scene. Of late, we can only experience this escape in a cinema. However, modern technology may be able to provide this same sight and sound experience right in your own living room. We will discuss the basic components of a home theater system in this article. Read on to understand how these basic components can deliver the best cinematic experience to a home theater system.
Home theater experts state that the most important consideration in setting up a home theater system is the size of the room where you will set up the home theater system. The most important component of the home theater system, which is the television, is dependent on the size of the room. Although, the recommendation is 27 inches television set at a minimum is necessary for your home theater set up. It is also a recommendation that a flat television is good for a home theater system because it exhibits fewer glares and produces a crisper image. Another major component of a home theater system that depends on the size of the room is the speaker. The number of speakers for your home theater system is dependent on the size of the room. You may add up to six speakers from the basic three speakers if you want a more lifelike sound. Adding a subwoofer may also be good to achieve a complete surround sound like in the movie theaters. Three speakers should be the minimum; you may go up to six if the room is big.
Another major for your home theater system is the DVD player. It is a recommendation that DVD players with progressive scan will be the best choice. This is because progressive scan produces sharp and flicker-free pictures. This however points back to the choice of television unit; you may need to check if the flat television set supports progressive scan signals. You may also acquire a five-disk carrousel DVD player. This will avoid having to stand up from your seat to change discs every so often. A minor consideration is the power rating that will determine how loud your speaker can be. Of course, almost all these depend on the size of the room to where the home theater system is going to be set up. Small room requires from few types of equipment, bigger rooms may require more and adding home theater furniture to your home theater system may be best. A bigger room thus requires more investments. A smaller room might require fewer but of good quality equipments to avoid the too basic feel of the home theater system.
Finally, you may acquire a beautifully designed home theater system if you consider hiring a home theater expert. If you can afford this, it will be best for you because the home theater expert will be able to effectively design and set up your home theater system. Your home theater designer may also add some features like home theater seating and other home theater furniture to be able to give the complete home theater package that closely resembles a real movie theater. Having the finest and high-quality home theater system will give you the most sought after set up that you could flaunt and enjoy to the max.
Saturday, April 6, 2013
Easy The flashing Heart
Buying a gift for someone special or a loved one can sometimes be difficult or expensive. The flashing heart is the answer. It is easy to build and even the inexperienced hobbyist should be able to build it. The estimated cost for the circuit is $25 if all the parts are purchased new. With The Flashing Heart, you can get your message across in bright lights.
Circuit Description
The Circuit Diagram is shown in Figure 1. It consists of a 4047 low-power monostable/astable multivibrator, IC1, used in the astable mode to provide the timing pulses to control the flash rate of the LEDs. To accomplish the astable mode, pins 4, 5, 6, and 14 are connected to +12VDC and pins 7, 8, 9, and 12 are connected to ground. Pins 1 and 3 are connected to C2 and pins 2 and 3 are connected to potentiometer R9. A fixed value resistor can be used in place of the potentiometer R9, if the flash rate does not need to be adjusted. These three pins make up the R-C timing circuit. The output pulses from the 4047 are taken from pins 10, 11, and 13. Pin 10 is the Q output and pin 11 is the Q-not output. These two pins are onnected to R6 and R7 respectively.
Click On Image To Enlarge
The collectors of Q2 and Q3 are connected to R4 and R5 respectively, which are connected to the cathodes of the Yellow LEDs. Pin 13 is the oscillator output and is connected to R8, which is connected to the base of Q1. The collector of Q1 is connected to R3, which is connected to the cathodes of the Red LEDs. The emitters of the three transistors are connected to ground. The Green LEDs are connected to R1 and R2, which are connected to +12VDC. Resistors R1-R8 are current limiting resistors and the correct wattage for these resistors should be used to prevent excessive heat. The resistive values may be changed to vary the brightness of the LEDs. The circuit is powered by PS1, a wall transformer, which is connected to a filter capacitor C1. It must be between 10 to 15 VDC and at least 500mA.
Construction
Probably the most difficult part of this project is making the printed circuit board, Figure 2. The board used in the prototype took several hours to make using dry transfers. Using a different technique, such as photo resist, may be faster for the experienced hobbyist. Once the board is etched and drilled, the jumper wires should be placed on the board and soldered, as shown on Figure 3. Next the 84 Yellow LEDs should be placed around the border of the board, followed by the 42 Red LEDs that make up the heart and then the 16 Green LEDs that make up the letters I and U. Resistors R1-R9 and capacitors C1and C2 should be placed on the board next and then the power supply, PS1. Sockets were used in the prototype for the I.C. and transistors. A socket for the I.C. is required, but the sockets for the transistors are not. Special care should be taken when handling the CMOS I.C., as a static discharge will destroy it. When you are finished soldering, check the board over for mistakes. If everything looks okay, apply power.
Click On Images To Enlarge
Operation
Once power has been applied to the circuit, the Red LEDs should all be flashing on and off together. The Yellow LEDs should be flashing on and off, but only every other Yellow LED should be on at one time. The Green LEDs will stay on at all times. The flash rate can be adjusted by turning R9. Connections for a fixed value resistor for R9 are provided on the board layout if preferred.To dress up the project, a favorite photograph can be placed in the heart, and a frame can be made to fit the circuit board.
| Parts List | |||||
| Resistors | |||||
| R1, R2 | - | 470 ohm, 1/2-watt | |||
| R3-R5 | - | 100 ohm, 3-watt | |||
| R6-R8 | - | 1000 ohm, 1.4-watt | |||
| R9 | - | 5000 ohm potentiometer | |||
| Capacitors | |||||
| C1, C2 | - | 100uF, 16 volts, electrolytic radial | |||
| Semiconductors | |||||
| IC1 | - | 4047, low power monostable/astable multivibrator | |||
| Q1-Q3 | - | 2n3643 NPN transistor or equivalent | |||
| Diodes | |||||
| LED1-LED84 | - | yellow light-emitting diode | |||
| LED85-LED126 | - | red light-emitting diode | |||
| LED127-LED142 | - | green light-emitting diode | |||
| Other components | |||||
| PS1 | - | 12VDC @ 500mA wall transformer | |||
| Miscellaneous: Jumper wire, solder, printed circuit board, | |||||
| drill and bits,14 pin I.C. socket, and a frame or case. | sourced by : link | ||||
Thursday, April 4, 2013
The damage Horizontal LG TV
Often find LG TV is switched off completely. After checking it Hor short TR / koslet so that all the inverter output voltage drop. Start with the appointment of TR page and check the voltage and turns back to normal. Do not always replace with a new TR because TR surely you will lose because they will surely be broken again, if immediate profits and normal life. After checking on the block capacitor Horizontal out that there was a rather plump and lifted it after it is dry there is no value of the capacitance.
 |
| LG TV |
Capacitor is located on the collector TR Hor bypassed to ground which is parallel with the diode. For the slim LG 21 "inch typically use 2kV 183j (18n 2kV) for the black pearl 29" using 103j2kv (10N 2kV). After replacement of capacitor TSB and TR Hor who just started a TV and Direct TV was OK. ve Also found a balck pearl TV LG 29 "wide image conditions and so OSD is only half visible. As usual checks are still in the horizontal section. Initially thought to drive the FET TR Hor damaged and wide after being picked and measured FET turns out they will be still good. And start There seem damaged parts elco 250v1uf which already began to get puffy and after replacement image remains the same.
And start looking again whats so broken, and who seemed to actually see the disease as I get 600V 154J capacitor looks a little plump. C they will begin to lift and measure it with tester tester x100K and was not moving at all a sign of C is dry. They will begin to replace the capacitor, because it does not have the same C 204J 250V only that there had to be replaced eventually with this one. Begin with a TV and the picture was no longer visible widening is normally only about the width of the CM because it is not the same capacitor.
Then enter the service menu by pressing MENU on the panel and press 2 times hold MENU on the remote and add value HOR WIDE to fit the image width and by pressing OK on the remote to save the settings and press AV to exit.
Solve buzzing and noise on the amplifier circuit
Power amplifiers that we sometimes raises a raft of small drone as groundingless than perfect.The following are some ways to cope with the hum of the power amplifier:
1. Keep sensitive circuits of the transformer, casing dimensions are not too small.One blog even suggested to use two-bok, bok special one for the transformer. For the toroid transformer or amplifier with a large transformer, should only contain a series of power amps, with no tone control.
2. Change the position of the transformer, side by side into the lower side (the transformer is high) withfacing a series of sensitive posts
3. Use a spacer on each PCB board as high as half the height of the transformer, eg as high as 2.5 cm or more so that the PCB board parallel to the core / center of the transformer, here the effect of the weakest fields.
4. We recommend using a stereo module instead of two mono modulesThis avoids wiring errors. If forced to, try to sizecable between the right and left modules as long and as short as possible.
5. Should take the ground path for the speaker of ct ct elco instead of the transformer,if the board pcb mounted two big elco (like elco power supply), takeground path of the speakers here, and check to hear!
6. Power supply for radio (TX or RX) is very sensitive, use a capacitor4x100nf, 4 pairs of these capacitors in parallel to each mem-diode (bridge).
7. At the tone control circuit IC op-amp that uses a symmetric power supply,sufficient ground wiring is taken from the signal ground wires only. shouldIC power supply (7812) installed near the main power supply, notmounted near the tone control.
8. Always use a stereo cable shrouded perfect (color stereo cablered-white-covered ground and wrapped in transparent skin.
9. For power supply, use capacitors of 2200uF per ampere elco
10. Zoom and ground wires as short as possible, especially a pair of elco (ct line between elco) power supply (can be tried for the amplifier blazer)
11. For the amplifier should be mounted to the computer casing when not in the ground soil is diground PC casing soil
12. Pairs of each kit to the circuit without passing groundnya nut / baud / spacer. Do not let the existing ground line at the hole pcb connected to the casing / box. Do not follow this ground. ground attached to the casing should have one. if necessary use a plastic spacerovercome the noise:
1. Use the active component (IC) that qualified as TL084, TL074, notLM324. LM324 any brand of noise. TL084 is more guaranteed authentic yellow (ST), not white. For now, the IC TL084 is printed white-work unstable frequencyhigh (treble breaks and more noise). For IC 4558 (NE5532) use plain white silk screening JRC4558D or TL072 - TL082 yellow, LF353 noise. LM741 (NE5534) can be replaced with the Hitachi HA17741, LF351 noise may also, has never been tried.we do not have to look for the brand and the price is more expensive because it is the most low noise.
2. If necessary, the circuit power amplifier OCL, lowering its gain by lowering the value ofresistor in the path gain from 33k to 22k speaker, mimics the gain-clone lower amplifier noise.
3. Should simplify the circuit, the circuit is too complex is more susceptible to noise and interference.
4. Should then potentio / volume mounted on the input-power amplifier, such as professional amplifier without tone control.
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