Showing posts with label making. Show all posts
Showing posts with label making. Show all posts
Thursday, December 19, 2013
The expert group is making every effort to enhance the design of the Cell Phone Jammers system
The expert group is making every effort to enhance the design of the Cell Phone Jammers system.
The standard test signal I1: is GsM modulated carrier signal, and its structure in accordance with the GSM signal burst (burst, as burst or short burst. Below) structure, but its all modulation bits (including the burst of part of the training sequence) are directly random or pseudo-random data stream. (5) The standard test signal I2: a standard GSM modulation signal, but with the C1 signal is different from the unexpected part of the training sequence of the standard GSM training sequence, but the burst of data bits (including bits 58 and 59) are random or pseudo-random data stream. Using the same standard RF cable and adapters, including adapters, including the requirements of the GSM bands between the channel loss is less than 0.5dB, loss of value of the difference is less than 0.2dB; DCS frequency band between the loss of each channel is less than 1dB, loss value difference is less than 0.3dB, with characteristic impedance adapter should be within 50 ± 5 ohms. The table will contain the result of quantity computation of Cell Phone Jammers .I use the above principles and interface technology to develop a project: Highway display guidance system. Installed on the highway in front of the LED display shows real-time road vehicle traffic situation and weather and climate conditions, advise and guide the driver, the correct driver. The use of the system to some extent, eliminate a lot of traffic hazards, thereby safeguarding the smooth flow of road safety and peoples lives and property. The system consists of the control center and several display screen. Control center in real time the latest information sent to the display. Building control center communication link with the display terminal, the traditional method of laying fiber optic cable with the cable or the realization, or build a private wireless network allowing wireless. Because of the special nature of the highway, the control center and the distance between the display terminal is usually very far, two programs must invest a lot of money and huge construction effort.
Typically, short message service SMS-based wireless data transmission monitoring and control system for a point to multipoint wireless two-way data communication and remote control system, shown in Figure 1. System control center or command center for data, from computer networks, databases, electronic map and GSM communication interface. The main control center complete the information and data transceiver and finishing: on the one hand, to receive various control points to upload information and data, and put them in the appropriate database and distributed to the appropriate monitoring computer in order to achieve the various monitoring points monitoring and management; another aspect, a computer control center monitors the response issued by the various monitoring points of the control information, and to the information issued to the corresponding control points to achieve the point of monitoring equipment for control purposes.
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The standard test signal I1: is GsM modulated carrier signal, and its structure in accordance with the GSM signal burst (burst, as burst or short burst. Below) structure, but its all modulation bits (including the burst of part of the training sequence) are directly random or pseudo-random data stream. (5) The standard test signal I2: a standard GSM modulation signal, but with the C1 signal is different from the unexpected part of the training sequence of the standard GSM training sequence, but the burst of data bits (including bits 58 and 59) are random or pseudo-random data stream. Using the same standard RF cable and adapters, including adapters, including the requirements of the GSM bands between the channel loss is less than 0.5dB, loss of value of the difference is less than 0.2dB; DCS frequency band between the loss of each channel is less than 1dB, loss value difference is less than 0.3dB, with characteristic impedance adapter should be within 50 ± 5 ohms. The table will contain the result of quantity computation of Cell Phone Jammers .I use the above principles and interface technology to develop a project: Highway display guidance system. Installed on the highway in front of the LED display shows real-time road vehicle traffic situation and weather and climate conditions, advise and guide the driver, the correct driver. The use of the system to some extent, eliminate a lot of traffic hazards, thereby safeguarding the smooth flow of road safety and peoples lives and property. The system consists of the control center and several display screen. Control center in real time the latest information sent to the display. Building control center communication link with the display terminal, the traditional method of laying fiber optic cable with the cable or the realization, or build a private wireless network allowing wireless. Because of the special nature of the highway, the control center and the distance between the display terminal is usually very far, two programs must invest a lot of money and huge construction effort.
Typically, short message service SMS-based wireless data transmission monitoring and control system for a point to multipoint wireless two-way data communication and remote control system, shown in Figure 1. System control center or command center for data, from computer networks, databases, electronic map and GSM communication interface. The main control center complete the information and data transceiver and finishing: on the one hand, to receive various control points to upload information and data, and put them in the appropriate database and distributed to the appropriate monitoring computer in order to achieve the various monitoring points monitoring and management; another aspect, a computer control center monitors the response issued by the various monitoring points of the control information, and to the information issued to the corresponding control points to achieve the point of monitoring equipment for control purposes.
Friday, March 15, 2013
Making a 200 watt Compact PWM Inverter Circuit Using Tiny Ferrite Transformer
This circuit was requested by a few of the dedicated followers of this blog, namely Mr. Rashid, Mr, Sandeep and also by a few more readers. Initially I could not figure out the concept behind these compact inverters which completely eliminated the bulky iron core transformers. However after some thinking it seems I have succeeded in discovering the very simple principle associated with the functioning of such inverters.
Lately the Chinese compact type inverters have become pretty famous just because of their compact and sleek sizes which make them outstandingly light weight and yet hugely efficient with their power output specs.
Initially I thought the concept to be unfeasible, because according to me the use of tiny ferrite transformers for low frequency inverter application appeared highly impossible.
Inverters for domestic use requires 50/60 Hz and for implementing ferrite transformer we would require very high frequencies, so the idea looked highly complicated.
However after some thinking I was amazed and happy to discover a simple idea for implementing the design. Its all about converting the battery voltage to 220 or 120 mains voltage at very high frequency, and switching the output to 50/60 HZ using an push-pull mosfet stage.
Looking at the figure we can simply witness and figure out the whole idea. Here the battery voltage is first converted to high frequency PWM pulses. These pulses are dumped into a step up ferrite transformer having the required appropriate rating. The pulses are applied using a mosfet so that the battery current can be utilized optimally.
The ferrite transformer steps up the voltage to 220V at it output. However since this voltage has a frequency of around 60 to 100kHz, cannot be directly used for operating the domestic appliances and therefore needs further processing.
In the next step this voltage is rectified, filtered and converted to 220V DC. This high voltage DC is finally switched to 50 Hz frequency so that it may be used for operating the household appliances.
Kindly note that though the circuit has been exclusively designed by me, it hasnt been tested practically, make it at your own risk and on;y if you have sufficient confidence over the given explanations.
Parts List for 12V DC to 220V AC compact ferrite core inverter circuit.
R3---R6 = 470 Ohms
R9, R10 = 10K,
R1,R2,C1,C2 = calculate to generate 100kHz freq.
R7,R8 = 27K
C3, C4 = 0.47uF
T1----T4 = BC547,
T5 = any 30V 20Amp N-channel mosfet,
T6, T7 = any, 400V, 3 amp mosfet.
Diodes = fast recovery, high speed type.
TR1 = primary, 13V, 10amp, secondary = 250-0-250, 3amp. E-core ferrite transformer....ask an expert winder and transformer designer for help.
Lately the Chinese compact type inverters have become pretty famous just because of their compact and sleek sizes which make them outstandingly light weight and yet hugely efficient with their power output specs.
Initially I thought the concept to be unfeasible, because according to me the use of tiny ferrite transformers for low frequency inverter application appeared highly impossible.
Inverters for domestic use requires 50/60 Hz and for implementing ferrite transformer we would require very high frequencies, so the idea looked highly complicated.
However after some thinking I was amazed and happy to discover a simple idea for implementing the design. Its all about converting the battery voltage to 220 or 120 mains voltage at very high frequency, and switching the output to 50/60 HZ using an push-pull mosfet stage.
Looking at the figure we can simply witness and figure out the whole idea. Here the battery voltage is first converted to high frequency PWM pulses. These pulses are dumped into a step up ferrite transformer having the required appropriate rating. The pulses are applied using a mosfet so that the battery current can be utilized optimally.
The ferrite transformer steps up the voltage to 220V at it output. However since this voltage has a frequency of around 60 to 100kHz, cannot be directly used for operating the domestic appliances and therefore needs further processing.
In the next step this voltage is rectified, filtered and converted to 220V DC. This high voltage DC is finally switched to 50 Hz frequency so that it may be used for operating the household appliances.
Kindly note that though the circuit has been exclusively designed by me, it hasnt been tested practically, make it at your own risk and on;y if you have sufficient confidence over the given explanations.
R3---R6 = 470 Ohms
R9, R10 = 10K,
R1,R2,C1,C2 = calculate to generate 100kHz freq.
R7,R8 = 27K
C3, C4 = 0.47uF
T1----T4 = BC547,
T5 = any 30V 20Amp N-channel mosfet,
T6, T7 = any, 400V, 3 amp mosfet.
Diodes = fast recovery, high speed type.
TR1 = primary, 13V, 10amp, secondary = 250-0-250, 3amp. E-core ferrite transformer....ask an expert winder and transformer designer for help.
Saturday, March 2, 2013
Making an Adjustable Electromagnet Circuit
This article describes a simple circuit which can be used for pulsing an electromagnet. The IC 555 once again becomes the central part of the circuit. Lets learn the making procedure of this simple gadget for varying the magnetic power of an electromagnet.
The circuit was requested by Mr.Jason, one of the followers of this blog. Though Im not sure of the application needs, the circuit probably can be used for controlling the average magnetic power of an electromagnet or rather the circuit may be considered an adjustable electromagnet circuit.
The circuit involved is quite basic and has been already employed in many applications, explained in my earlier posts. Here the application is quite similar to the earlier ones, that is controlling the output load through a series of varying pulses or through PWM method.
The mark/space ratio can be appropriately adjusted using the shown configuration, which in turn can be used for varying the response of the output load.
Here the output load is an ordinary homemade electromagnet, connected via a power transistor TIP 122.
The power of the electromagnet is at the maximum level when the pot is set for achieving high mark levels than the space levels and vice versa for reducing the magnetic effects of the electromagnet.
The electromagnet may be procured ready made or can be hand made at home using suitable lengths of enameled cooper wire wound over a magnetic core, like an iron nail or rod etc.
The diode connected across the electromagnet protects the transistor from back emf fluxes of the electromagnet.
The circuit may be powered with voltages between 5 and 12, but the current must be appropriately rated, otherwise the circuit will fail to operate.... if a battery is used, make sure its rated at least at around 1 AH.
Once powered, the circuit will enable smooth adjustments of the electromagnets magnetic field from zero to maximum.
The circuit was requested by Mr.Jason, one of the followers of this blog. Though Im not sure of the application needs, the circuit probably can be used for controlling the average magnetic power of an electromagnet or rather the circuit may be considered an adjustable electromagnet circuit.
The circuit involved is quite basic and has been already employed in many applications, explained in my earlier posts. Here the application is quite similar to the earlier ones, that is controlling the output load through a series of varying pulses or through PWM method.
The mark/space ratio can be appropriately adjusted using the shown configuration, which in turn can be used for varying the response of the output load.
Here the output load is an ordinary homemade electromagnet, connected via a power transistor TIP 122.
The power of the electromagnet is at the maximum level when the pot is set for achieving high mark levels than the space levels and vice versa for reducing the magnetic effects of the electromagnet.
The electromagnet may be procured ready made or can be hand made at home using suitable lengths of enameled cooper wire wound over a magnetic core, like an iron nail or rod etc.
The diode connected across the electromagnet protects the transistor from back emf fluxes of the electromagnet.
The circuit may be powered with voltages between 5 and 12, but the current must be appropriately rated, otherwise the circuit will fail to operate.... if a battery is used, make sure its rated at least at around 1 AH.
Once powered, the circuit will enable smooth adjustments of the electromagnets magnetic field from zero to maximum.
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