I need to design a power supply using a full bridge rectifier and some voltage IC's. I am using a multi output transformer connected to mains and the outputs available are (in rms) : 6v, 9v, 12v, 15v, 18v. I need a 5v rail (using lm7805ct) and then a 12v rail and -12v rail (lm7812ct and lm7912ct). The data sheet species that the lm7812ct needs an input voltage of 19v, is this absolutely necessary? If so how do i use my transformer in order to get the right input for 12v and -12v? The 5v rail needs to supply a current of about 310mA and the 12v and -12v's need to supply about 80mA. Any help in the way of circuit diagrams and explanations? Help is greatly appreciated
Mod edit: moved to Homework Help
Mod edit: moved to Homework Help
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