I Have a problem with my Arduino nano (CLONE) when I plug ESP8266 module VCC into 3.3 Pin. Suddenly Arduino Nano port's disappear.
Here my schematic
How to fix that?
The 8266 draws a lot of power when operating, I doubt the 3.3v line can supply that and you are pulling the power supply to the processor on the Arduino down and it stops working.
Google using the 8266 and power supplies
It is always useful with the ESP's using 3.3V to also use a capacitor in the power line to help account for voltage drops.
Almost any electrolytic from 47 uF to 1000 uF between GND and VCC.
It acts like a simplified storage device to help remove surges when TX is used.