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A 13,8v/5Amp 78H05 based power supply for portable use. In this example used to power up a Yaesu FT-817

13.8 V / 15 A from a PC Power Supply in German

ON6MU 4 A power supply using a BDX33

A good overview article on power supplies by Karl Shoemaker AK2O of the Spokane Repeater Group