I relocated the IRF510 to the other side of the board and have it screwed to the metal case I have the Bitx40 in. I currently use a 19v laptop supply to power the rig with 19v on the IRF510 and a small DC DC converter set to 12v to run the rest of the rig. This allows me to power the rig from any voltage above 12v to a max I have tested of 28v without having to make adjustments or mods to have the correct volts on the board and raduino.
I have 2 rigs set up this way, 1 on 40 and the other on 80 meters,neither have any issues with getting too hot at least on SSB.
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Mike VK3XL
