Homebrewing is called for.

Last years radio amateur handbook has a design for a 28 volt regulated
power supply and while I would feel comfortable building a proven design I
do not feel comfortable to redesign that regulating section for my needs.

So the question is does anyone have a diagram for a proven 12-14 Volt
regulated supply for 10 to 25 amps??



Go here and download the supply you need:

http://www.repeater-builder.com/rbtip/astron-index.html

The Astron supplies are well proven and the design is a very common one
similar for all regulatied supplies using the 723 chip.