DIY: Upgrade Your JBC245 Soldering Iron

If you often do DIY work, then you definitely need a portable high-power soldering iron, like the T12 OLED or a high-frequency soldering iron. But the heating cores are expensive and prone to failure, although JBC is already the best soldering iron. You can get a JBC245 with a 939 tip heating core, and you'll also need a JBC-T12 control board and a 936-modified handle.

The IBM16V7.5A adapter looks like the one shown below, and you'll need to modify it to 24V by yourself.

If the output voltage goes above 19V, it will trigger protection. To raise the overvoltage protection threshold, increase the resistance inside the blue circle 19C (15.4K) as shown in the diagram below. Change it to 20K to get an OVP around 25V.

As shown below, you also need to adjust the resistor in the red circle 69B (5.11K). Decreasing it will increase the output voltage. Change it to 24V.

Then, reinstall it into the adapter.

You can also use Velcro straps to make storage easier.

The JBC245 is rated at 130W high power and can reach 370℃ in about 3 seconds. The 3-second speed isn't just about being fast—it's crucial for soldering computer multilayer boards with minimal temperature loss and fast recovery.

After these modifications, ordinary soldering irons—including T12s—can sometimes damage components before you even remove them when soldering computer multilayer boards. Using a normal temperature without pushing all the way to 370℃, around 300℃ works perfectly.

Done.