desk lamp for electronics project?

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Vij

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i am a beginner in making electronics project.i wanted to do a circuit which i saw in the EFY magazine(june 2008,page90).i wanted to know the function of the following components
1.the 2 zener diodes(20V,.5W)
2.MOFSET(IRF830)
3.BC548
4.C1,.220mF capacitor
i wish to know what a MOFSET is and its function.

I f possible give me a suitable link which will help me in understanding the circuit better.
 
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