Stupid question:What happens if you power it as intended. Through the USB port, with a computer.Leo..
Ofcourse it's heating up.I already tried to explain why and how much.
If it works on a PC, then get a regulated 5volt phone charger with micro-USB cable/plug.Then you can just plug it into the USB socket.
i think it is still heating too much compared for example to my other esp8266 devices, it's what i m trying to explain.