ABSTRACT   This project is he design and construction of a voltage inverter system with trickle charging system. This device is design to provide power supply for the need of offices, household etc. In absence of NEPA power supply. It would also prevent harm to our appliances caused by power holding company LTD (NEPA) Random power outage . TABLE OF CONTENT Title Page Approval Page Dedication Acknowledgment Abstract Table of Contents CHAPTER ONE Introduction Most Essential Circuit in the Device Transformer  Oscillator  Pre " Amp Automatic Control Unit Charging System General Aim and Objective of the Design  CHAPTER TWO Diode Capacitance Transistor Biasing Transistor Configuration Static Characteristics Relation Current D.C. Load Line Transistor as an Amplifier Transistor as a Switch CHAPTER THREE Mosfets De Mosfet Depletion Mode of N- Channel De Mosfet Enhancement Mode of N- Channel De Mosfet E " Only Mosfet Biasing e " Only Mosfet De Mosfet Amplifiers E " Only Moset Amplifier Transformer CHAPTER FOUR  Feature of the Device Input Unit Oscillating Unit Pre- Amplification Unit  Step Up (Transformer) Unit Switching Unit  Charging Unit General Circuit Diagram Operation of the Device CHAPTER FIVE  Construction and Packaging  Packaging Conclusion  Recommendation

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