Ruba Sbaih Jeelan ataree Supervisor: Prof: Marwan Mahmod

 An oscillator is a circuit that outputs a repetitive electronic signal i.e. a sine wave.  The Colpitts oscillator is known for using a capacitor voltage divider as its feedback source  Advantages include:  Frequency stability.  A simple and robust design.

 For oscillation to occur the Barkhausen criteria must be met.  Loop Gain  Phase Shift must equal zero  Magnitude equal to unity  Realistically the magnitude will be greater than 1  Determine if criteria is satisfied by checking the loop gain at the frequency of oscillation

 Design a Colpitts oscillator using and using it for lighting the fluorescent lamp.  Build and test design  Obtain frequency of oscillation  Output a non-distorted sine wave from self- oscillation

PV

 We tried three circuit for the colpitts oscillator: First:

 Second :

And the third one :

 This is the output signal By noting the # of squares We found that the Frequency is 9KHZ and the output voltage 200 v

 By installing suitably sized switched capacitors into the circuit, the Power Factor is improved and the value becomes nearer to 1 thus minimising wasted energy and improving the efficiency of a plant.

 The colpitt oscillator does not expensive because its circuit very simple and required only a single transistor free And when we use the PV cell to supply the power to the oscillator we will not need any type of power supply to play it.