MATERIALS

Design & Construction of Intelligent security system for apartment

Design & Construction of Intelligent bank security system

Design & Construction of 2-way wired intercom

Design & Construction of Solar power auto street light

Design & Construction of Auto room light controller

Design & Construction of Numeric Controlled Door Locking System

Design & Construction of Automatic Bell Ringer

Design & Construction of Portable fm transmitter

Design & Construction of Remote control fan

Design & Construction of 500w audio amplifier

Design & Construction of Remote control ac lamp

Design & Construction of Intelligent emergency light

Design & Construction of Sensor operated automatic door open/close machine

Design & Construction of 3-input public addressing system

Design & Construction of Under and over voltage power protection system

Design & Construction of Remote control gate

Design & Construction of Generation of constant power supply using DC source

Design & Construction of 5KVA modified sine wave converter

Design & Construction of Sound activated device

Design & Construction of Automatic oven controller

Design & Construction of 200W Bass guitar power amplifier

Design & Construction of Temperature control incubator

Design & Construction ofAuto water level controller

Design & Construction of Power failure alarm with auto generator starting device

Design & Construction of UPS

Design & Construction of 60W power amplifier

Design & Construction of Audio isolation transformer

Design & Construction of FET amplifier

Design & Construction of Stereo power amplifier

Design & Construction of Home audio amplifier

Design & Construction of 100W audio amplifier

Design & Construction of Subwoofer audio amplifier

Design & Construction of Security beeper

Design & Construction of 180w amplifier

Design & Construction of 45W power amplifier

Design & Construction of Single chip 60W amplifier

Design & Construction of 600w amplifying circuit

Design & Construction of Home theatre audio amplifier

Design & Construction of High quality 150W power amplifier

Design & Construction of Mini microphone circuit

Design & Construction of 300w Hi-Fi amplifier

Design & Construction of Audio preamplifier with tone control

Design & Construction of 200W stereo amplifier

Design & Construction of Bass power amplifier

Design & Construction of Transistor power amplifier

Design & Construction of Headphone amplifier

Design & Construction of Sweeping tone alarm beeper

Design & Construction of 3-chanel microphone mixer

Design & Construction of Police siren

Design & Construction of 4-channel audio mixer

Design & Construction of Audio megaphone

Design & Construction of SCR tester

Design & Construction of Guitar headphone amplifier

Design & Construction of Guitar amp

Design & Construction of Op-amp booster design

Design & Construction of 5-channel equalizer

Design & Construction of 3-band dual graphic equalizer

Design & Construction of audio power amplifier

Design & Construction of 10-input Mixer amplifier

Design & Construction of Equalizer amplifier

Design & Construction of Tape-radio-mic audio input amplifier

Design & Construction of Tone control circuit

Effect of western TV program on Nigerian youths

effects of temperature on viscosity of water,milk and corn oil

Design and Construction of temperature control circuits

Design & Construction ofAlternating on-off switch

Design & Construction of Ac voltageregulator/stabilizer

Design & Construction of UPS power supply

Design & Construction of Variable power supply

Design & Construction of Dual power supply

Design & Construction of Audio power indicator

Design & Construction of Amplifier input module

Design & Construction of Transformer-less power supply

Design & Construction of Intruder alarm

Design & Construction of Power failure alarm

Design & Construction of Remote control ac lamp

Design & Construction of Car demobilizing system

Design & Construction of Car anti-theft device

Design & Construction of Miniature fm transmitter

Design & Construction of Auto intruder alarm

Design & Construction of Power supplies

Design & Construction of Automatic battery chargers

Design & Construction of Wailing alarm

Design & Construction of Rain activated alarm

Design & Construction of Beeper

Design & Construction of TV, AM, FM antenna booster 

Design & Construction of Water level controller

Design & Construction of Fuel/water level indicator

Design & Construction of Auto turn-off battery charger

Design & Construction of Dark/light activated alarm

Design & Construction of Power and audio amplifier

Design & Construction of 10-input microphone mixer

Design & Construction of Transistor organ

Design & Construction of 50/80w audio amplifier

Design & Construction of Headphone amplifier

Design & Construction of Solar panel

Design & Construction of solar water heater

Design & Construction of No pollution power generator

Design & Construction of Sound or Clap activated  alarm

water-dry indicator wind energy  generator

Design & Construction of power failure alarm

How to build a Radio

Power generation using wind turbines,

Resistance In Series & Parallel

Kirchhoff’s Law

Solar Photovoltaic Modules for Education

Home Wiring

Demonstration Type Transformer.

generation of wind energy

Generation of solar energy

Solar energy installation

water turbine power generation

solar power bicycle

solar Principle and design ofsolar panel

design and construction of astable  multivirator

solar water heater

No pollution power generator

Sound or Clap activated alarm

water-dry indicator

wind energy  generator

Alternating on-off switch

Ac voltageregulator/stabilizer

UPS power supply

Design & Construction ofVariable power supply

Design & Construction of Dual power supply

Design & Construction ofAudio power indicator

Design & Construction ofAmplifier input module

Design & Construction ofTransformer-less power supply

Design & Construction ofIntruder alarm

Design & Construction of Power failure alarm

Design & Construction of Remote control ac lamp

Design & Construction ofCar demobilizing system

Design & Construction of Car anti-theft device

Design & Construction of Miniature fm transmitter

Design & Construction of Auto intruder alarm

Design & Construction of Power supplies

Design & Construction ofAutomatic battery chargers

Design & Construction ofconstruction ofWailing alarm

Design & Construction ofRain activated alarm

Design & Construction of Beeper

Design & Construction of TV, AM, FM antenna booster 

Design & Construction of Water level controller

Design & Construction ofFuel/water level indicator

Design & Construction ofAuto turn-off battery charger

Design & Construction ofDark/light activated alarm

Design & Construction ofPower and audio amplifier

Design & Construction of10-input microphone mixer

Design & Construction ofTransistor organ

Design & Construction of50/80w audio amplifier

Design & Construction of Headphone amplifier

Design & Construction of Solar panel

Design & Construction of solar water heater

Design & Construction of No pollution power generator

Design & Construction of Sound or Clap activated  alarm

water-dry indicator
wind energy  generator

Design & Construction ofpower failure alarm

How to build a Radio

Power generation using wind turbines,

Resistance In Series & Parallel

Kirchhoff’s Law

Wheatstone Bridge

Solar Photovoltaic Modules for Education

Home Wiring

Demonstration Type Transformer.

generation of wind energy

Generation of solar energy

Solar energy installation

water turbine power generation

solar power bicycle

solar Principle and design of solar panel

design and construction of astable  multivirator

Design & Construction of solar water heater

design and construction of 2000w inverter system


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

fm transmitter

the design and construction of mini radio broadcast transmitter and audio console using frequency modulation (fm) with power rating of 1 watt

contruction of an 500w transistor amplifier

the design and construction of a 40 watt hi-fi amplifier

design and construction of a 3 way inter-communication system

the design and construction of car controller using telemetry system

design and construction of a single phase automatic change over switch with phase selector

the design and construction of an inverter

the design and construction of a three phase automatic phase selector

design and construction of a two lane traffic light

the design and implementation of a four – way traffic light control circuit.

design and construction of a multiperpose security system with alarm and display

construction of 200w uninterruptible power supply

the design and construction of an uninterrupted power system (ups)
the design of a 500watts uninterruptible power supply with voltage leo indicator [inverter]

design and construction of an automatic phase selector

design and construction of power amplifier

the design and construction of electric arc welding machine

design and construction of uninterruptible power supply

design and construction of an audio amplifier

the design and construction of a dc to ac power inverter incorporated with an automatic switch over battery charger

design and construction of voltage inverter system with trickle charging system

design and construction of an automatic voltage stabilizer

construction of an automatic change over switch (3.7kva)

design and construction of sound detector with alarm system

design and construction of 25amps single phase automatic change over

design and construction of digital incubator

construction of an intruder alarm system

the design and implementation of electronics sequential sign patter display

the design and cosntruction of 1000kwa stabilizer

design and construction of 12volts car battery automatic charger with voltage level indicator and charging process display

design and construction of 45w audio power amplifier

design and construction of fire alarm system in a two storeyed building

design and construction of a 60 watts power amplifier

design and construction of a single phase auto-transformer of rating 1kva, 240v/110, 80 12v, 6v

design and construction of temperature control oven

design and construction of metal detector

protection of overhead transmission against lightning

design and construction of a single phase auto-transformer of rating 1kva, 240v/110, 80 12v, 6v

ABSTRACT

The project presents here is on design and construct a single phase auto-transformer of rating 1kva, and step down voltage of  240v/110, 80, 12v, 6v.

An autotransformer is an electrical transformer with only one winding. In an autotransformer portions of the same winding act as both the primary and secondary. The winding has at least three taps where electrical connections are made. Autotransformers have the advantages of often being smaller, lighter, and cheaper than typical dual-winding transformers, but autotransformers have the disadvantage of not providing electrical isolation.

Autotransformers are often used to step up or step down voltages in the 110-117-120 volt range and voltages in the 220-230-240 volt range—for example. Providing 110 or 120V (with taps) from 230V input, allowing equipment designed for 100 or 120 volts to be used with a 230 volt supply
An autotransformer has a single winding with two end terminals, and one or more terminals at intermediate tap points. The primary voltage is applied across two of the terminals, and the secondary voltage taken from two terminals, almost always having one terminal in common with the primary voltage. The primary and secondary circuits therefore have a number of windings turns in common Since the volts-per-turn is the same in both windings, each develops a voltage in proportion to its number of turns. In an autotransformer part of the current flows directly from the input to the output, and only part is transferred inductively, allowing a smaller, lighter, cheaper core to be used as well as requiring only a single winding. One end of the winding is usually connected in common to both the voltage source and the electrical load. The other end of the source and load are connected to taps along the winding. Different taps on the winding correspond to different voltages, measured from the common end. In a step-down transformer the source is usually connected across the entire winding while the load is connected by a tap across only a portion of the winding. In a step-up transformer, conversely, the load is attached across the full winding while the source is connected to a tap across a portion of the winding.

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