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Kläuser@BG441117551 Iface the same issue. The green light is steady on. If I press the button for more than 3s, the led flashes and I hear beeps but there is no pulsing. Instead, the led goes back into steady light. If I try to weld, the LED flashes and the beeps are there but it does not work. Afterwards the led light is always on again.

klemic 04/07/2020
After I assembled the board with beeper, capacitor and the cables it was not working. There was no power at the welding tips. When checking the boards circuit I found this: MCU output -> drives a PNP transistor -> drives the gates of the N-ch FETs. I post a photo of the schematic: It cannot work. The diode is assembled in wrong direction (the PNP transistor will never switch on) and even if it is reversed it cannot work. The PNP transisitor is always on then because the voltage after the diode can never be higher than MCU power supply (5V) plus diode forward voltage. I removed the diode, PNP transistor and the rest and replaced it by a PC817 optocoupler, after that the spot welder works as intended. (The original circuit may work for battery voltages up to maybe 7-8V but not higher). Did the manufactiurer made this change recently? Other users will experience the same issue like me...
DIY Переносной аккумулятор хранения Сварочная машина для точечной сварки Печатная плата для сварки Оборудование для сварки точечными сварщиками для 18650 26650 12V
US$18.99 US$34.99
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