desk lamp for electronics project?

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.

{ 1 comment }

electro_nnn July 7, 2010 at 8:00 pm

I suggest you to simulate your circuit in program like PSPICE or PROTEUS first. (especially PROTEUS)
Zener diode: (maximum acceptable power is 5Watts, inverse break voltage is 20Volts (Until -20V the diode won’t allow current to flow but after this voltage the resistance of diode will become nearly zero))
http://en.wikipedia.org/wiki/Zener_diode
MOSFET:
http://en.wikipedia.org/wiki/MOSFET
IRF830:
http://www.datasheetcatalog.com/datasheets_pdf/I/R/F/8/IRF830.shtml
BC548 Transistor:
http://www.datasheetcatalog.com/datasheets_pdf/B/C/5/4/BC548.shtml
For the capacitor you probably will need its maximum voltage too.

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