colpitts final
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Ruba SbaihJeelan atareeSupervisor:
Prof: Marwan Mahmod
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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.
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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
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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
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PV
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We tried three circuit for the colpitts oscillator:
First:
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Second :
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And the third one :
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This is the output signal By noting the # of squares We found that the Frequency is 9KHZ and the output voltage200 v
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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.
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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.