Dual Channel DC power supply

[Julian Wong]

Hi,i really need help on how to design a dual channel DC power supply that fulfills the following specifications :

1) Operation - User selection between independent adjustment for positive and negative output voltage, and series tracking mode (slave channel tracks the master channel)

2) Output voltage amplitude : 0-20V± 5%

3) Current limit : 0 - 1.5A± 10%

4) Powered Directly from main supply

5) Indications of power on, constant voltage and constant current mode

I really hope you guys will be able to help me as i need to hand in my assignment by the end of this month,kinda short of time and hopefully you all will be able to provide me with a schematic to achieve the above specifications..thanks in advance =)