DC power supply

hi,
Can anyone help me design 4 different 9 volt DC power supplies to operate from 230 volts AC.
The 4 DC power suppliers have the same full wave rectifier with capacitor filtering but using different methods of voltage regulation for each power supply. The current rating should be 0.3Amps and the voltage variation within 10%.

Please help, or give me a website i can get this from...Thankz

If this is a homework assignment, it should be posted in that forum, not here.

thanks, it is can you still help me out on the different regulation method

nitez said:

thanks, it is can you still help me out on the different regulation method

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How many different methods do you have so far?

Well, let me ask you: were you paying attention in class? What have you covered so far? Rectification? Filtering? Voltage regulation?

What exactly would you like help with? is there something in particular you need help understanding?

We're not here to do your homework for you; that's your job. We will be happy, however, to give you hints, pointers, or help clarify something you're having trouble with.