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When there's heat that means there's a lot of energy being wasted.That probably means there's a short in the board: either inside a component or on the traces.I think what's happening with your Arduino is some component(s) between the USB and ATMega are broken. When you run it off battery, you bypass those components and nothing heats up.Be careful with the heat! You might want a new Arduino to prevent breaking your computer's USB port or anything else.
Start Your Car With a Rope (Dead Battery Life Hack)
I didn't have a schematic: it was very arbitrary.If you look at the datasheet for the 2560, you can decide what features you want to have.Here is the original schematic of the Arduino Mega: https://www.arduino.cc/en/uploads/Main/arduino-mega2560_R3-sch.pdf
Make a Custom Bic Brander
Hi,Towards the end of the instructable I talk about how I solder ISP programming pins. If you have an ISP programmer you can burn the bootloader that way.
For this I didn't bother with the capacitors.http://embeddedelectronicsforatmegaseries.blogspot...according to this blog, there are calculations you can do for the crystal to see what capacitor to use.
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