Dual Power Supply

Hi!
I have been trying to make a +15 0 -15 regulated power supply. I have been using a pair of LM 723C with TIP 3055 and TIP 2955 (I think I have the correct number here) as the pass transistors (NPN and PNP) for the +ve and -ve sides repectively. I am interested in a dual supply which can supply up to 2 amps with high regulation and as low ripple as possible.

The question is - are there resources which explain the use of the 723 in detail? Can I make sure that the +ve and -ve rails are at the same level from 0? Do I really need 2 723s? Lots of questions I know. Many thanks to anybody who can help me even on one of the questions here!

Thanks
roy
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