I'm trying to design a development board.
I want it to be powered from USB or an external dc source which will be regulated on the board.
I would like to join both USB and the regulator to one 5v bus. At first I though of using schottky diodes between the supplies and the 5v bus. But this way I loose regulation.
Is there anyway to have both supplies supplying the 5v bus ?
If not, is there any way to showdown the regulator if usb voltage is present ?
I only have access to jellybean components (eBay mostly).
Thanks in advance,