New Engineering project topics

SOLAR ENERGY INSTALLATION- FOR BSC

AUDIO AND POWER AMPLIFIER- FOR BSC

BATTERY CHARGERS (CELL PHONE, CAR) – FOR BSC

ALARMS OF DIFFERENT TYPES- FOR BSC

TOUCH ACTIVATED SWITCH AND ALARMS- FOR BSC

AM-FM-SW-TV ACTIVE ANTENNA- FOR BSC

FM TRANSMITTER – FOR BSC

WATER LEVEL INDICATOR WITH ALARM- FOR BSC

AUTO TURN-OFF BATTERY CHARGER- FOR BSC

RAIN ALARM- FOR BSC

REMOTE CONTROL AC LAMP- FOR BSC

DARK AUTOMATED SWITCH- FOR BSC

MOTORCYCLE ALARM – FOR BSC

DC-AC INVERTER WIT 555 TIMER- FOR BSC

BREAK LIGHT FLASHER- FOR BSC

VOLTAGE COMPARATOR- FOR BSC

FUSE MONITORING ALARM- FOR BSC

AUDIO MIXER – FOR BSC

SOLAR CELL PHONE CHARGER- FOR BSC

AUTOMATIC TRICLE CHARGER- FOR BSC

TONE CONTROL- FOR BSC

AUTO DAYLIGHT ALARM- FOR BSC

HIGH AND LOW VOLTAGE CUT-OUT WITH DELAY- FOR BSC

TRANSMITTER ORGAN- FOR BSC

AUTOMATIC OVEN CONTROLLER- FOR BSC

UPS POWER SUPPLY- FOR BSC

SEVEN SEGMENT LED COUNTER – FOR BSC

AUTOMATIC VOLTAGE REGULATOR- FOR BSC

AUTOMATIC VOLTAGE REGULATOR- FOR BSC

GATE ALARM- FOR BSC

HEADPHONE ALARM – FOR BSC

FULL-DUPLEX INTERCOM- FOR BSC

CHRISMAS LIGHT- FOR BSC

FIRE DOOR ALARM- FOR BSC

AUTO FAN SPEED CONTROLLER – FOR BSC

MINIATURE FM TRANSMITTER- FOR BSC

AC LINE CURRENT DETECTOR- FOR BSC

VARIABLE POWER SUPPLY- FOR BSC

ZENER DIODE TESTER- FOR BSC

FM RECEIVER- FOR BSC

ULTRASONIC PEST REPELLER- FOR BSC

POWER SUPPLIERS – FOR BSC

WATER ACTIVATED ALART- FOR BSC

WATER LEVEL INDICATOR WITH ALARM- FOR BSC

POWER FAILURE ALARM- FOR BSC

SELF ACTIVATING POWER SUPPLY- FOR BSC

MICROPHONE MIXER – FOR BSC

EMERGENCY SIREN SIMULATOR- FOR BSC

TRANSFORMERLESS POWER SUPPLY – FOR BSC

DESIGN AND CONSTRUCTION OF A 2000W INVERTER

DESIGN AND CONSTRUCTION OF A D.C TO A.C INVETER SYSTEM

THE CONSTRUCTION OF A 3-PHASE MOTOR OPERATION INDICATOR

CONSTRUCTION OF PVS CONDUIT WIRING SYSTEM OF TWO BEDROOM BUNGALOW

CONSTRUCTION OF A 12 VOLT BATTERY CHARGER

CONSTRUCTION OF AUTOMATIC CHANGE OVER WITH GENERATOR TRIP OFF

Auto Night Lamp Using High Power LED

Auto Night Lamp Using High Power LEDs is a circuit which turns ON the LED lights interfaced to it at night time and it turns OFF the lights automatically when it is day. Usage of LEDs is growing day by day due to the advantages they provide compared to the conventional filament bulbs or fluorescent lamps. They provide good quality of white light with a better intensity compared to others. They also consume less power compared to their alternatives. These are the advantages which the LEDs encourage us to use them compared to their alternatives.

In this article, we shall see the circuit and the working of turning on or off of high power LEDs with light intensity. The element which is used for sensing light in the circuit is the light dependent resistor. The resistance of the light dependent resistor depends on the light incident on it. If the intensity of light incident on it is more, then the resistance of the circuit decreases. If the intensity of light incident on it decreases, then the resistance of the device increases. We are making use of this property of the light dependent resistor to detect the light and thereby operate the LEDs. We are arranging twenty five light emitting diodes in an array such that five LEDs are in series and five such series LEDs are arranged in parallel.

 

The transistors are used in saturation mode. They are used as electronic switches in this mode. The transistor BC547 is a general purpose NPN transistor which is used to further switch the LEDs. This is a power transistor with a heat sink. The heat sink helps the transistor to dissipate the generated heat into air so that the transistor can handle higher power loads than it can do without the heat sink.

The entire circuit along with the LEDs is powered by a 12V DC power supply. A battery based DC power supply is usually preferred. However, you can use a ac rectified and regulated power supply.

The LEDs used in the circuit are high powered white LEDs. The intensity of light produced by these LEDs equals an ordinary fluorescent bulb. The lighting produced is sufficient for reading or to do any other daily activity. The circuit can be assembled on a printed circuit board with all the components neatly arranged and the LEDs placed in order. Try to place the LEDs maintaining a distance of about 1 cm between the LEDs so that the the lighting will be well distributed in your room.

Pull Pin Security Alarm System

his circuit helps us to get alerted when anybody picks our pockets or bags. The circuit is very helpful to prevent our goods getting pick pocketed. The circuit is called a pull pin security alarm because it gets activated as soon as the pin is pulled.

 

The arrangement of the circuit is as follows. The circuit has a pin which is fixed to the pocket and the other end is attached to the circuit. The circuit remains inactive until the wallet is in your pocket as the circuit gets activated when the wallet is pulled from your pocket.

When the wallet is in the pocket, the circuit has the pin attached thereby the circuit remains inactive. Whereas when the wallet is removed from the pocket, the pin gets detached from the circuit thereby the circuit gets activated. When the circuit gets activated, the circuit turns ON the mini loudspeaker. The mini loudspeaker is fed with an alternating signal of audio frequency. This signal vibrates the loud speaker at an audio frequency so that it is well heard to us.