SDG #341 ATETOOL AD680D 80W 230V Soldering Iron

The Atetool AE680D is an 80 W soldering iron with an unusual design: its cartridges run directly from the mains, with no transformer or low voltage conversion, and the control loop switches the mains supply. The rating is credible because the power is set by the cartridge resistance, and the iron peaked at about 175 W on heat up before settling. The chunky plastic handle has silicone sleeves, a short strain relief, three buttons for temperature and menu control, and an LED that pulses whenever the heater is powered, with a small inline control unit carrying a 0.96 inch OLED. Cartridges are retained by a grub screw that bears directly on the cartridge neck and must not be hot swapped. Five tip geometries are available and the UK price is about £37.

A cold cartridge measures around 130 ohms, implying over 400 W at 230 V before the resistance rises with temperature, with the tip bonded to mains earth and isolated from both heater terminals. The menu covers a temperature lock, standby after five minutes without movement and sleep after a further ten, an offset compensation and a two point calibration. Calibration was about 9C out at 350C and corrected with the offset.

The teardown shows the handle buttons on a resistor ladder into one ADC line and no thermocouple at all: the control unit, built around an HC32F005 Cortex-M0+ microcontroller with a capacitive dropper supply and a triac, measures the heater resistance during the off periods to infer temperature. The approach gives good accuracy on the calibrator but limits heavy work, with a four layer board averaging about 45 W and the coin test falling short. For general purpose soldering it works well and safely at a low price, with cartridge choice as the main limitation.