A cinema installed mobile phone jammers
The newest Mobile Phone jammers make use of the 6 channel design which has solved the problems of signal unsteady or short amplifier distance, etc.
I want you to some common problems list in mobile phone jammers and method to solve these problems.Because of the widespread use of mobile phone, we noticed a lot of problems occur in the public, one of which is a noise. To stop the noise, caused by mobile phone, mobile phone jammers are placed in the public domain, theatre and cinema is one of them. Cell phone jammer is not a new thing, in the foreign actors, they used to complain that all mobile phone when watching this program.
Only in 2004, in France, a cinema installed mobile phone jammers, so the audience doesnt ring interrupted while enjoying the great movies from the mobile phone.
In 2007, an old theater, founded in 1756 in Russia decided to install and open mobile phone jammers when the display, because many people will not listen to rule without the use of mobile phone in the opera.The thing is, the theatre, the actors cant stand mobile phone. In the stage: nonsense, let me finish my words! It is very expensive to use the best 4g cell phone jammer in the theater, at that time, but all of a sudden stop interference to the actor, theater to spend so much money.According to the audience, because blockade of the wifi cell phone jammers for sale, the entire concert is really very quiet, no mobile phone ring tones in all. People in the enjoyment of opera, but many people are about people may try to contact them for some unexpected events.
A lot of people think it would be better if the theater, tell them about the use of mobile phone jammers, so they can make some arrangements with their friends and family. Most of the audience that the mobile phone jammers is really necessary in some high class of this concert.
But it did theater really use high-power radio interference when the display? Reporter talked about this a charger. He said they have built many devices in the beginning of the opera, mobile phone will have a great influence, so they use their mobile phone and portable cell phone jammers for sale stop the audience would not stop using their mobile phone."We just found no mobile phone signal, they are blocked?" recently, the audience will find a theater in Changzhou, when they are watching classical opera. Theres something to tell us, portable cell phone jammer 3g sale best will be open in some places like theaters and concert once a program to determine the quiet.
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I want you to some common problems list in mobile phone jammers and method to solve these problems.Because of the widespread use of mobile phone, we noticed a lot of problems occur in the public, one of which is a noise. To stop the noise, caused by mobile phone, mobile phone jammers are placed in the public domain, theatre and cinema is one of them. Cell phone jammer is not a new thing, in the foreign actors, they used to complain that all mobile phone when watching this program.
Only in 2004, in France, a cinema installed mobile phone jammers, so the audience doesnt ring interrupted while enjoying the great movies from the mobile phone.
In 2007, an old theater, founded in 1756 in Russia decided to install and open mobile phone jammers when the display, because many people will not listen to rule without the use of mobile phone in the opera.The thing is, the theatre, the actors cant stand mobile phone. In the stage: nonsense, let me finish my words! It is very expensive to use the best 4g cell phone jammer in the theater, at that time, but all of a sudden stop interference to the actor, theater to spend so much money.According to the audience, because blockade of the wifi cell phone jammers for sale, the entire concert is really very quiet, no mobile phone ring tones in all. People in the enjoyment of opera, but many people are about people may try to contact them for some unexpected events.
A lot of people think it would be better if the theater, tell them about the use of mobile phone jammers, so they can make some arrangements with their friends and family. Most of the audience that the mobile phone jammers is really necessary in some high class of this concert.
But it did theater really use high-power radio interference when the display? Reporter talked about this a charger. He said they have built many devices in the beginning of the opera, mobile phone will have a great influence, so they use their mobile phone and portable cell phone jammers for sale stop the audience would not stop using their mobile phone."We just found no mobile phone signal, they are blocked?" recently, the audience will find a theater in Changzhou, when they are watching classical opera. Theres something to tell us, portable cell phone jammer 3g sale best will be open in some places like theaters and concert once a program to determine the quiet.
Best Battery Charger Circuit Diagram
Best it mean UJT battry charger circuit diagram. This UJT battry charger circuit diagram will not work unless the battery to be charged is connected with proper polarity. The battery voltage controls the charger and when the battery is fully charged, the charger will not supply current to the battery. The battery charging the current is obtained through the SCR when it is triggered into the conducting state by the UJT relaxation oscillator.
The oscillator is only activated when the battery voltage is low. V8281 of the UJT is derived from the voltage of the battery to be charged, and since Vp= Vn= V8281 ; the higher V828` the higher Vp. When Vp exceeds the breakdown voltage of the zener diode Zl, the UJT will cease to fire and the SCR will not conduct. This indicates that the battery has attained its desired charge as set by R2.
UJT battry charger circuit diagram
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How to Build a Electronic Telephone Ringer
How to Build a Electronic Telephone Ringer. This circuit produces a ringing sound similar to that made by more recent telephones. It consists of three almost identical oscillators connected in a chain, each generating a squarewave signal. The frequency of each oscillator depends on the RC combination: R4 and C1 around IC1.A, R8 and C2 around IC1.B and R12 and C3 around IC3.C.
The pairs of 100 kΩresistors divide the asym-metric power supply voltage (between 5 V and 30 V) so that, in conjunction with the 100 kΩfeedback resistors (R3, R7 and R11) either one third or two thirds of the supply voltage will be present at the non-inverting inputs to the opamps. The voltage across the capacitor therefore oscillates in a triangle wave between these two values.
The pairs of 100 kΩresistors divide the asym-metric power supply voltage (between 5 V and 30 V) so that, in conjunction with the 100 kΩfeedback resistors (R3, R7 and R11) either one third or two thirds of the supply voltage will be present at the non-inverting inputs to the opamps. The voltage across the capacitor therefore oscillates in a triangle wave between these two values.
Electronic Telephone Ringer Circuit Diagram:
The first oscillator is free-running at a frequency of approximately 1/3 Hz. Only when its output is high, and D1 stops conducting, can the second oscillator run. The frequency of the second oscillator is about 13 Hz, and optional LED D3 flashes when it is running. When the output of the second oscillator is low, the third is allowed to run. The frequency of the third oscillator is around 1 kHz, and this is the tone that is produced. The second oscillator is not absolutely necessary:
its function is just to add a little modulation to the 1 kHz tone. A piezo sounder is connected to the output of the third oscillator to convert the electrical signal into an acoustic one. The current consumption of the circuit is just under 1 mA with a 5V power supply, rising to about 1.65 mA with a supply volt-age of 15 V.
Super High Power Portable TV and FM Jammer Circuit Diagram
This is the Super High Power Portable TV and FM Jammer Circuit Diagram. There are still neighbors that keep annoying you by having loud the TV or the radio? Well I have you the solution. In fact all neighborhood will face your jamming waves at their TVs and radios, so be careful.
This Jammer is the improved version of the old `TV and FM jammer schematic` with the difference of much higher power. Many of you where asking for a stronger and wider effect but to be as portable as can be. Looking at the schematic you can see that, only the parts are changing keeping the basic circuit intact. Have in mind that this version needs heat sink and antenna to keep the transistor alive.
Super High Power Portable TV and FM Jammer Circuit Diagram
The power source comes from three 9 volt batteries in series, so we use 27 volts at input, and we get a power full 2,5 Watts at output.
You are going to need 70cm to 2 meter simple wire antenna.
As for the transistor Q its the 2N3553. Its a RF Power Silicon NPN Transistor in a TO39 type package designed to be used in amplifiers and oscillator applications in military and industrial equipment.
Usually found as an output driver, or in predriver stages in VHF equipment, but because here we dont care about the modulation of the signal but just the power, thats why we use it as a first and final output driver.
The transistor is specified at 175MHz and 28V to give: Output Power: 2.5W, Minimum Gain: 10dB and Efficiency: 50%.
The parts are: R1=10k, R2=2,2K, R3=100 C1=47uF/50V, C2=2.2nF, C3=10pF, SW=switch, B=Battery 9V.
The coil L should be closely wound 5 turns (start tunning with the closely wound distance of turns and then play with it and the C4 capacitor, to find the desired frequency )of enameled copper wire 1.5mm and internal coil diameter of 1cm (leads 2x20mm).
The variable capacitor C4 should be air trimmer capacitor rating 4 to 30 pf or the closest to this value.
Connect the batteries in series place the best heat sink for TO39 case you can get and pack it all in a small plastic box. Enjoy ;)
Datasheet file1: Click here to download 2n3553 datasheet.
Build a Positive And Negative Voltage Switching Supply
Build a Positive And Negative Voltage Switching Supply. An LT1172 generates positive and negative voltages from a 5-V input. The LT1172 is configured as a step-up converter. To generate the negative output, a charge pump is used. C2 is charged by the inductor when D2 is forward-biased and discharges into C4 when LT1172`s power switch pulls the positive side of C2 to ground.
Positive And Negative Voltage Switching Supply Circuit Diagram
Automotive LED Timing Light
A useful timing strobe can be constructed using high-brightness LEDs and a few common components. Ignition pulses from the number 1 cylinder high-tension lead are used to trigger the circuit via a home-made inductive pickup. Transistors Q1 & Q2 buffer and amplify the pulses from the pickup, which then drive the inputs of three Schmitt-trigger inverters (IC1a, IC1c & IC1f). Each positive pulse at the inverter inputs causes a low pulse at their outputs, forward-biasing D2 and immediately discharging the 6.8nF capacitor. When the capacitor is discharged, the inputs of the second bank of three inverters (IC1b, IC1d & IC1e) see a logic low level, so their outputs go high, driving Q3 into conduction and powering the LED array. After the pulse ends, the IC1a, IC1c & IC1f inverter outputs return high, reverse biasing D2.
However, it takes some time for the 6.8nF capacitor to charge to the logic high threshold voltage of the inverters’ inputs, effectively stretching the initial pulse width and lighting the LEDs for the required amount of time. The pickup can be salvaged from an old Xenon timing light or made up from a "C" type ferrite or powered iron core large enough to fit around a HT lead. Some experimentation will be required to determine the number of turns required to achieve reliable triggering. About 100 turns of light-gauge wire proved sufficient on the prototype. A cleat is used to close the magnetic path around the lead and is held in place with a large battery clip. Miniature screened microphone cable can be used to connect the pickup to the circuit, to prevent interference from other sources.
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However, it takes some time for the 6.8nF capacitor to charge to the logic high threshold voltage of the inverters’ inputs, effectively stretching the initial pulse width and lighting the LEDs for the required amount of time. The pickup can be salvaged from an old Xenon timing light or made up from a "C" type ferrite or powered iron core large enough to fit around a HT lead. Some experimentation will be required to determine the number of turns required to achieve reliable triggering. About 100 turns of light-gauge wire proved sufficient on the prototype. A cleat is used to close the magnetic path around the lead and is held in place with a large battery clip. Miniature screened microphone cable can be used to connect the pickup to the circuit, to prevent interference from other sources.
12 Volt Battery Guardian
Dont get caught with a flat battery; this easy-to-build circuit can cut off the power to a 12V fridge or car stereo system if the battery voltages drops below critical level. Electric fridges in vans and 4WDs are a great idea but if you are not careful, they can severely discharge the battery and leave you stranded. Maybe the battery will end up with severe damage as well. The same problem applies if you have a big stereo system and you like to play it without the motor running.
Main features:
- Cuts power to load (eg, fridge) when battery voltage drops below a preset level.
- 10A rating.
- Low power drain.
- Chirping sound during cut-out.
- Flashing LED indication during cut-out.
- Automatically reconnects power when battery recharged.
Operation on 12V is fine when the motor is running and battery charge is maintained but if the fridge is allowed to run for too long when the motor is stopped, it can flatten the battery in a relatively short time. This is where the Battery Guardian comes into play. It monitors the battery voltage and disconnects power to the fridge before the battery becomes too flat to allow the engine to be started again.
Parts layout:
PCB layout:
Circuit diagram:
Source: Silicon Chip 6 May 2002
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