936like i said aixun told me directly they dont plan to support the 936 now so i highly doubt they will bother. i could be wrong but i was told this directly by them.
I’m glad I stumbled upon this discussion. I am also in search of the pinout for the Aixun T3A. I bought one with the T245 handle and three tips, but I want to rewire it for my T12 and 907 soldering irons. I have some valuable insights to share about soldering stations that can save you a lot of headaches. Manufacturers are not forthright about the technical details of their stations, but a lot can be gleaned from their manuals.
The terms “thermistor” and “thermocouple” are often used interchangeably even by manufacturers, but are significantly different. Thermistors increase in resistance in response to temperature changes whereas thermocouples generate voltage. The low-cost Fakkos as well as the old Hakkos 907-type soldering handles typically use thermistors, while modern, high-end cartridge-type T12, T245, and some newer 907-type handles use thermocouples. The handle’s compatibility with a given soldering station is determined by its sensor type and wiring. As a rule, all cartridge-type handles use thermocouples, for other types of soldering equipment, it’s difficult to tell without close inspection.
Thermistors are simpler to measure, but their accuracy is typically lower. One circuit supplies 24V to the heater coil for heating, while another supplies a low voltage through the thermistor. The voltage drop read has a near-linear correlation with the temperature. The heater is regulated by cycling the power on and off, or by adjusting the supplied voltage. Thermocouple controllers can be made using basic analog or digital circuits.
Thermocouples provide higher accuracy but require more complex sensing circuitry. Like thermistors, the heater and thermocouple can be in separate wires with the heater supplied with 24V while the thermocouple is read. In a series configuration, however, power is intermittently cut off to the heater, allowing the small voltage generated by the thermocouple to be read. This method protects the sensing circuit from the heater's higher voltages.
If a thermocouple-type handle is connected to a thermistor-based controller, the heating will be minimal as the controller detects little resistance across the thermocouple. Alternatively, if a thermistor-type handle is wired to a thermocouple-based controller, the handle will heat up fast to a cherry red in just less than a minute. This is because the controller detects little to no current from the thermistor. Unfortunately, the author of this article was unaware of this important detail:
https://www.instructables.com/Soldering-to-Desoldering-Station-Hack/