18650 lithium battery charger (TP4056)

1.Feature description

A commonly used tool in electronic production, the 18650 lithium battery charger designed with TP4056 costs about 1 yuan.

• The onboard 3.3V low-voltage step-down chip can directly convert the lithium battery voltage to 3.3V to power the microcontroller;
• TYPE-C and MicroUSB charging ports are freely selectable;
• The USB-A port is reserved to test the line sequence and continuity of the USB cable;

2.Welding instructions

The circuit description of each part is as follows:

Among them, the components that must be welded are as shown below, which only realize the charging function of 18650 lithium battery.

Lithium battery holder can be fixed with silicone rubber

The finished product after welding all components is as follows:

I used this charger, paired with a boost module, to create a smoker. It is used to suck the fumes produced by welding away from the mouth and nose, which is safer than inhaling them directly.