T12 soldering iron tip heating principle！

T12 white light soldering iron head is white light soldering iron heating speed and fast, temperature control and accurate, heating core at the forefront of the temperature measurement. The design is also very clever. Its heating wire is a material, the middle root wire is another kind of wire. The combination point is the thermocouple, which is the temperature measurement point. The heating wire itself is the heating body, but also the working end of the thermocouple.

    In practice, the two sections of the soldering iron to apply PWM voltage can be, this project with STC8H1K17 microcontroller to generate a certain frequency and duty cycle of the PWM wave, as a signal output to the transistor, the transistor as a switching role. T12-PWM for positive voltage, VBUS and T12-OUTPUT conductive, and can output (5-20v) voltage to the iron head, the frequency and duty cycle of the output voltage and T12-PWM consistent. The output voltage (5-20v) is provided by the PD charger.