|1||5V||V+ (Hi-Link Adapter)|
|2||GND||V- (Hi-Link Adapter)|
You may notice that we have an aluminum capacitor rated at 16V. This capacitor is used to smooth out the 12V DC converted by a big, yellow capacitor and a resistor, however; sharing the DC source, instead of using Hi-Link converter, could overload this 12V setup, and the main energy chip is not stable. At peak of transmitting, ESP8266 needs 200mA.