# PWM Signal Voltage MOD

The newest batch of Pixhawk 6C mini now supports switchable PWM signal voltage (3.3V or 5V). The modification requires the user to open the casing of the Pixhawk flight controller and be familiar with soldering.

{% hint style="warning" %}
Any damages caused during the modification are not covered by warranty
{% endhint %}

{% hint style="danger" %}
The IMU daughter board is glued to the case, please be careful when removing the flight controller outer case during disassembly.
{% endhint %}

Once you remove the top half of the flight controller casing, you'll notice the ribbon connector with silicone glue along its sides. The connector isn't fully adhered to, so it can be detached with a small amount of force. After removing the ribbon connector, you'll have safe access to the back side of the PCB for making modifications to the PWM signal voltage.

To switch the PWM signal voltage, bridge the 3v3 or 5v soldering pads on the PCB by applying solder on the pads. Make sure the unused pads are cleaned and not shorted.

For Pixhawk 6C mini, you have the option to change the PWM signal voltage for FMU outputs and IO outputs separately. Make sure the correct soldering pads are bridged to avoid any damage.

Pixhawk 6C mini-A (legacy) and mini-B have slightly different PCB designs. Follow the red square in the diagram below to locate the PWM voltage select soldering pad.

<figure><img src="/files/VAzlPWSkEewObE6IbXg4" alt=""><figcaption><p>Pixhawk 6C mini-A PCB</p></figcaption></figure>

<figure><img src="/files/SXO1VYjg9Zn7hE34nm1Y" alt=""><figcaption><p>Pixhawk 6C mini-B PCB</p></figcaption></figure>


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