Efxkits's Videos 63 videos
Model No: 225 This rash driving warning system will come handy for the highway traffic police as it will not only provide a digital display in accordance with a vehicle’s speed but also sound an alarm if the vehicle exceeds the permissible speed for the highway. The system basically comprises two IR sensor pairs, which are installed oppositely on the highway. The time taken is determined by the 555 TIMERS and output is fed to the Decade Counter and displays the time on a 7-Segment Display taken by the vehicle in crossing the required distance from one pair to the other from which the speed of the vehicle can be calculated. In case the vehicle speed crosses the limits a buzzer gives beeps to indicate that the vehicle has crossed the speed limit. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. And it is then regulated to +12V using a voltage regulator 7812 which is required for the operation of the Decade counter, 555 Timer and other components. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 19 Apr 2012
  • 684
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Model No: 222 Manual buzzers used for quiz competitions in schools and colleges create a lot of confusion in identifying the first respondent. This circuit includes 8 number of push Buttons which are fed to a D-type flip-flop which generates o/p signal fed to transistor, making the corresponding LED to be ‘ON’ after a particular competitor has pressed the pushbutton with a buzzer. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the IC & other components. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 19 Apr 2012
  • 782
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Model No: 216 In this project a switch is implemented that is turned ON and auto OFF by touching a wire contact, instead of a regular switch. Touch switches have no mechanical parts to wear out, so they last a lot longer than regular switches. Touch switches can be used in places where regular switches would not last, such as wet or very dusty areas. This is achieved by operating a 555 Timer in monostable mode while its trigger point is connected to a touch pad. Human body induced mains supply develops a voltage on the touch pad to trigger the monostable of 555 Timer, the output of which drives a relay for time period as decided by the time constant formed by R and C of the monostable. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 19 Apr 2012
  • 397
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Model No: 214 The operation of the circuit depends on the astable mode of the 555 timer, which is driven by the emitter current coming from BC109C/ BC548 transistor, since this transistor has high gain. Being in astable mode the IC 555 functions as an oscillator or as a free running mode. To power the 555 oscillator in full operation of the series transistor, it needs to be enabled by a larger current that flows in the collector circuit. This is made possible when the transistor is switched ON by the small current that flows between the base and emitter because of the loop/moisture or wetness sensed by the probes at contact points. On the other hand, the transistor will remain OFF and without any bias during dry conditions. To control the conduction of the circuit, a switch for ON/OFF state is supplied. The probe contacts should be made of non-reactive metal so that there will be no capacitance or impedance present. It can be achieved by salvaging silver or gold plated contacts from old relays. A cheaper alternative is wiring alternate copper wires. Since the transistor is in emitter follower mode, the impedance at the emitter or the oscillator circuit acts as the current limit so placing a base resistor is no longer required. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 14 Apr 2012
  • 641
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Model No: 215 This simple circuit activates a relay when it senses a composite video signal. This allows the user to use the tuner built into VCR to turn ON and OFF older TVs that are not equipped with a remote. It can also be used to activate surround sound equipment, turn off the room lights, turn ON video game consoles, etc. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 14 Apr 2012
  • 589
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Model No: 213 This is a Precise Charge Controller for Solar Photo Voltaic Panel. The main scope of project is the photovoltaic cells while converting the sunlight in to electricity a charge controller circuit is used. Photovoltaic cells come in many sizes, but most are 10 cm by 10 cm or round and generate about half a volt (0.6 being the PN junction voltage of a silicon diode) of electricity. PV cells are bundled together in modules or panels to produce higher voltages and increased power. A 12-volt module, depending on its power output, could have 30 to 40 PV cells. As the sunlight varies in intensity the electricity so generated usually charges through the charge a set of batteries for storing the energy. Charge controllers comprising of MOSFET are used as power semiconductor switches to ensure cutoff at fully battery charged condition. It also has the provision of overload, deep discharge and under volt of battery protection and the load. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 14 Apr 2012
  • 626
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Model No: 212 A circuit is designed which flashes a light whenever there a call in phone. The circuit uses an Optoisolator and relay is used to make the load ON and OFF driven by a transistor. This system can be very useful in a situation where there is lots of noise and it is impossible to hear the phone, such as a workshop, factory etc. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 14 Apr 2012
  • 633
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Model No: 209 The aim of the project is to make a low voltage and high voltage indicator. This system will save costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages. The circuit features auto reset and utilizes easily available components. It makes use of the comparators available inside 555 timer ICs. Supply is tapped from different points of the power supply circuit for the display and control circuit operation to achieve reliability. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +9V using a voltage regulator 7809 which is required for the operation 555 timer. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 14 Apr 2012
  • 497
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Model No: 204 This project is implemented in such a way that the lights glow according the music. This music operated running lights circuit uses IC’s. The music (sound) signals are sensed by a condenser microphone which is then amplified by an IC. The outputs of the IC are fed to the transistors to drive bulbs LED’s those dance as per the music played. One variable resistor is required for microphone sensitivity and another for maximum performance. The circuit works off 9V to 12V power supply. It is assembled on a general-purpose / dedicated PCB and connecting bulbs for the load the action can be seen live. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 14 Apr 2012
  • 642
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Model No: 202 This project proposes automatic detection of human and Energy saving room architecture to reduce standby power consumption and to make the room easily controllable with an IR control of a home appliance. The proposed auto detection of human is done using the IR sensor to indicate the entering of the persons. Microcontroller continuously monitors the infrared receiver. When any object pass through the IR receiver then the IR rays falling on the receiver are obstructed, this obstruction is sensed by the microcontroller. This system is used to turn ON a load whenever the IR ray is blocked by an object, person etc. A 38 KHz signal is generated by 555-timer which is feed to the IR diode which in turn produces an IR ray of 38Khz.This ray is received by tuned IR receiver continuously. Whenever there is an obstacle to the IR ray the receiver sends a signal to the microcontroller which actuates a load, from its output. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 13 Apr 2012
  • 450
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Model No: 193 Using this project we can jam the emerging TV Remote signals on reaching the IR Receiver at the TV end. We send higher strength modulated 38 KHz signal that a normal TV Remote delivers, generated through a 555 Timer in astable mode so that we can jam or stop the TV Remote signals reaching the TV Receiver. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 13 Apr 2012
  • 330
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Model No: 192 With the impending scarcity of many valuable resources, people are now starting to consider other means or sources of energy. While there have been many studies on the viability of wind or water energy, when it comes to an easy transportable energy solution, solar energy is now the major contender since it is the easiest to collect energy from. All you will ever need is a trusty solar panel. At this point in humankind's existence, most of the energy that many households consume is gathered from the numerous power plants that are then powered by fossil fuels. Fossil fuels unfortunately are nearing their extinction and becoming more and more expensive to source and this is why we're faced with rising electric bills each month. Not only is it an expensive resource, but it also contributes negatively to the environment. The gas that are emitted by the major power plants cause such a harmful effect on our environment that we are now facing a much bigger problem called global warming. So with all these problems, it is about time to capitalize more on developing energy from the sun. Solar energy is free as the sun is a free resource that anyone can take advantage of. And it is readily available since anyone can have access to it. The main objective of this project is to track the sun and rotate the solar panel accordingly, to receive sunlight to the fullest extent always during the day time. This movement is achieved by interfacing a stepper motor to the solar panel( a dummy solar panel is given in the project) that changes its direction according to the positioning of the sun. This is achieved using time reference that controls the movement time for 12 hours by a program written in such a way that for every given time the solar panel faces to the sun to generate maximum power which is stored in batteries and future use. This procedure is better than light sensing, as it malfunctions in cloudy and rainy seasons. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 13 Apr 2012
  • 571
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Model No: 190 The main problem about a railway analysis is detection of cracks in the structure. If these decencies are not controlled at early stages they might cause huge economical problems affecting the rail network (unexpected requisition of spare parts, handling of incident and/or accidents). This project uses a microcontroller from 8051 family. It is an 8-bit 40 pin microcontroller. The main objective of this project is to develop detecting the crack in the railway track and alert the near by station. Two rails forming the part of the track are made using a pair of discontinuous wire which biases a pair of transistors being powered from DC source. The discontinuation is sorted by a jumper wire to simulate healthy track condition. Removing the jumper results in transistors being cut off thus delivering logic one to the microcontroller. The program thereafter takes control to send SMS message through GSM modem interface through MAX232 to the microcontroller. An LCD is also interfaced with the MC to display the status of GSM and the crack. The proposed model is able to recognize the cracks thus providing security for railways. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 13 Apr 2012
  • 431
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Model No: 186 This is a method to ease adjusting the position of an antenna to improve reception at a television received by the antenna. An electronic dish position control system is made up of two motors that enable the dish to rotate both in horizontal and vertical direction, remotely controlled by infrared means. In order to reduce the speed, geared motors are used that are interfaced to the outputs of the microcontroller which are driven by a motor driver IC L293D. One IR sensor (TSOP) is used to receive the remote commands which are fed to microcontroller that decodes the data to rotate the motor in the desired direction via motor driver IC. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 12 Apr 2012
  • 965
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Model No: 181 Fuzzy controllers are very simple conceptually. They consist of an input stage, a processing stage, and an output stage. The input stage maps sensor or other inputs, such as switches, thumbwheels, and so on, to the appropriate membership functions and truth values. The processing stage invokes each appropriate rule and generates a result for each, then combines the results of the rules. Finally, the output stage converts the combined result back into a specific control output value. The project shall be using a microcontroller with a set of switches or a matrix key pad to define the speed of the BLDC in percentage of its rated speed being displayed in a LCD display. The output from the microcontroller drives the motor through a driver circuit. PWM (Pulse Width Modulation) wave can be used to control the speed of the motor. Here the average voltage given or the average current flowing through the motor will change depending on the ON and OFF time of the pulses controlling the speed of the motor i.e. The duty cycle of the wave controls its speed. On changing the duty cycle (ON time), we can change the speed. By interchanging output ports, it will effectively change direction of the motor. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more details visit www.efxkits**** or www.facebook****/edgefx
  • 12 Apr 2012
  • 790
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Model no:180 These days the electricity department has to send employees for taking meter reading every month, which is an expensive and time consuming job. This project provides a convenient and efficient method to avoid this problem. The electricity office can take the readings of consumers using GSM at their place. The main objective of the project is to develop a wireless based energy meter reading system. Also the loads can be controlled GSM using this project. The microcontroller takes the reading from the energy meter and displays the reading on the LCD. The reading of the energy meter is also sent to the control room by a message via GSM modem. This GSM modem also receives commands from any cell phone to control the electrical loads. It uses a standard energy meter that delivers output pulses for microcontroller to do counting for necessary action. On receiving command it can even switch ON/OFF the load. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 3 Apr 2012
  • 924
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Model no:174 The main objective of this project is to develop a system of wireless power transfer for medical applications. Many people use pace makers (An electronic device that works in place of a defective heart valve) implanted in their body that runs on a battery. The patient is required to be operated every year to replace the battery. This project is designed to charge a rechargeable battery wirelessly for the purpose. This project is formed out of an AC 230V 50Hz to AC 20 KHz at 12V circuit. The output is fed to a tuned 20 KHz coil forming as primary of an air core transformer. The secondary coil develops a voltage of 20 KHz at 12volt while it is kept over the primary coil where air is used as the core. The output of the secondary is given to a high frequency bridge rectifier that delivers DC which is then regulated to maintain a constant charging current to a NiCd (Nickel Cadmium) rechargeable battery. Normally these batteries have a long life of 7 years. Thus the patient’s operation time can be deferred to each 7 year after for replacement of the battery as the charging can be done for 7 years externally. But in the project a DC fan motor is provided in place of a battery charging arrangement for better visibility.
  • 3 Apr 2012
  • 741
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Model no:178 This project is applicable for industrial use in life cycle testing of lamps, relays, and switches as the number of ON/OFF use affects the life of such products. They are kept on fixed number of operations for the same. It uses microcontroller from 8051 family. A keypad is interfaced with MC to enter the required number. 7-segment LED is used for displaying the counts. Once the circuit is powered, the counter is set using the keypad to count down anywhere from 999 to 0. The counter starts counting in the decrementing order from the set number to 0 and simultaneously sensing the load condition (i.e. bulb in this circuit) turns ON and OFF by a relay to finally turn OFF once the counter reaches 0. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 3 Apr 2012
  • 486
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