DIY Guide to Assembling a Portable T12 Soldering Iron

If you're interested in assembling a digital T12 soldering iron, take a look at this article and follow along with the DIY steps.

Here's the control board:

You can skip the thermistor and use a fixed 25 compensation instead. Pin 1 can be modified through the handle to allow the soldering iron tip to be grounded separately.

The power supply is 24V 3A, and the build quality is decent.

If space is tight, the handle and control board can be separated.

Be careful not to solder the aviation connector incorrectly, as repeated soldering may damage the appearance.

You can salvage the red component from a discarded barcode scanner.

The handle can be repurposed from a discarded thermometer.

It fits perfectly with the T12.

After testing, the power is 71W, and it's not overestimated.

And that's it! Now you have a portable soldering iron, making it more convenient for on-the-go use.