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1:48
Model no: 155 Based on the principle of PWM controlled BLDC / PMDC motor on closed loop feedback giving RPM reference of the motor by a shaft mounted IR sensor is fed to the control the circuit. A display unit displays the full speed and one can enter the desired percentage with help of Keypad to reduce the speed. The pulse width would be automatically adjusted to maintain the DC power to the motor such that the entered speed percentage matches the RPM. The above operation is carried out by using one opto isolator and a MOSFET for driving the BLDC motor IR sensing is used for getting the speed reference to the microcontroller as error signal somewhat equivalent to a fuzzy / PI logic control. 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 +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
30 Mar 2012
473
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2:33
model no: 156 The main objective of the project is to control the speed of a DC motor through PC. Keyboard commands from the PC generate PWM output features. The functionality of this circuit is that once the PC sends the command signal to the microcontroller through MAX232 that is used to convert the voltage level of PC to that of microcontroller. Later, the microcontroller analyses these signals and activates the motor driver to drive the motor as desired. 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 +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
30 Mar 2012
190
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1:53
Model no: 159 The main objective of this project is to develop a project to control the appliance through SMS. Using any mobile a message is sent to another sim loaded GSM modem on board that receives the sms and feeds it to a level shifter IC MAX232 that feeds the data to a programmable microcontroller of 8051 family and the output logical data to relay driver IC that finally controls the home appliances or any load through its “NO” contacts and then sending a confirmation from the GSM modem upon the status of the load based on the data received from the microcontroller. All conditions are seen on a 16X2 display. 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 +5V using a voltage regulator 7805 which is required for the operation of the microcontroller, GSM modem and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
30 Mar 2012
396
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1:03
Model no:161A The main objective of the project is to develop a circuit breaker which can be controlled remotely using cell phone. A unique password must be entered through the keypad of cell phone to activate/deactivate the circuit breaker. Each key of the password is identified with a frequency which is decoded to digital code through DTMF (digital tone multi frequency) decoder and that code is fed to a microcontroller which is programmed to recognize the code for operating the circuit breaker duly interfaced through driver IC for the load. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
31 Mar 2012
672
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1:21
Model no: 167 These Solid State Switches are phase controlled in a similar manner to a light dimmer, in that they are turned on for a part of each cycle. The average voltage is controlled by varying the conduction angle of the switches. Increasing the conduction angle will increase the average output voltage. Controlling the average output voltage by means of solid state switches has a number of advantages. One of the major advantages being the vast improvement in efficiency relative to the primary resistance starter, due to its low on state voltage of the solid state switches. Typically, the power dissipation in the starter, during start, will be less than 1% of the power dissipated in a primary resistance starter during start. Another major advantage of the solid state starter is that the average voltage can be easily altered to suit the required starting conditions. By variation of the conduction angle, the output voltage can be reduced, and this can be achieved automatically by the control electronics. After the motor reaches desired speed the semi conductor switches are bypassed to feed full voltage to the motor. A single phase induction motor is connected in series with two anti-parallel SCR’S and supply. The gates of the respective SCR’S are fed from two Opto-isolator LED’S are connected in series which are driven by a transistor BC558 IN series with another external LED. One quard operational amplifier LM339/ LP339 is used as comparators for developing zero voltage reference at its pin1, that passes through a driving transistor BC547. To charge and discharge 2.2uf capacitor through resistor10k thus at the collector of transistor BC547 a saw tooth voltage is developed which is fed to pin4 of LM339, being the inverting input. A level voltage derived from the soft start of LM324 output through a diode IN4148 is given to the non-inverting input pin5 of LM39. The level voltage at the time of switch ON remains rely high as a result the output pin2 of LM339 remains high to reverse bias the transistor BC558 thus depriving the input to the Opto-isolator’s through the series Red LED. This level voltage gradually falls which while compared with saw-tooth voltage develops a varying duly cycle with in 10msec time duration synchronised with the mains supply frequency. Therefore the varying duly cycle from 10% to 100% happening over couple of seconds results in slow power build up by the motor as the SCR’S are triggered slowly from 180 to 0 degrees. The soft start circuit that uses LM324 and a transistor BC558 works at the time of switch ON by a charging a capacitor 2.2mf through 10k resistor. Thereafter this capacitor discharges through 100k and 470k, the midpoint of which are given to a non-inverting pin of LM324. Thus as a capacitor gets fully charged during switch ON and gets gradually discharge. Pin 1 of LM324 output slowly falling from high to low thus as explained above. The motor gets slowly from minimum power to maximum power to enable a soft start condition for a motor. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
31 Mar 2012
1351
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3:02
Model no: 168 This project describes the design and implementations from a single phase ac to high voltage DC power supply till 10kV output. The implementation of the hardware work to build a high voltage DC power supply is meant for use in the laboratory. The designed DC power supply can be used in industrial applications also. The design of the circuit involves voltage doubler, whose principle is to double the output voltage. The output from the voltage doubler is given to a series of cascaded circuit that generates up to 10KV but for the student project it is advisable to go up to 2KV for safety reasons. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
2 Apr 2012
639
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0:55
Model no:170 The main functionality of this project is to verify the identity / attendance of the user who needs to access it through RFID. For this purpose the authorized person is given an RFID card. This card contains an integrated circuit that is used for storing, processing information through modulating and demodulating of the radio frequency signal that is being transmitted. Thus, the data stored in this card is referred as the identification/attendance of the person. Once, the person places the card in front of the RFID card reader, it reads the data and verifies it with that data present in the microcontroller. Here we use microcontroller from 8051 family. And if the data matches then it displays a message as valid entry and allows accessing the device or else displays invalid and denies the access/attendance. For display a 16X2 LCD is used. The status also can be retrieved from this system by pressing the status button interfaced to microcontroller. 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
2 Apr 2012
471
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1:38
Model no:172A The main objective of the project is to intimate a desired number stored in an external EEPROM that someone is trying to open your bank locker in your absence. This project uses a microcontroller from 8051 family. Also an external memory EEPROM is interfaced to it for storing the number to which call is to be made. The module is placed behind the door and with microcontroller interfaced with a switch, which will detect unauthorized opening of the bank locker door and will automatically dial to the desired telephone number that is stored in the EEPROM through DTMF encoder interfaced to the microcontroller. Keypad is used for changing the password and a 16X2 LCD is used for display. 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
636
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1:40
Model no:173 The basic idea for the development of the project is to provide supply to the single phase load if any of the phases, out of the 3 phases go missing. The kit is to be supplied with a 3phase power i.e., the three transformers are connected to the 3 phases supply. If any one of the phase is not available, the logic gates monitor the same at the low voltage of DC derived from ac of the secondary of the transformers to deliver output to the relay driver IC to change the load to the next phase through the contacts those are fed from all the three phases. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
3 Apr 2012
708
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2:22
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
739
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1:31
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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2:49
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
923
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