This module works by communicating with suitably capable PD USB-C chargers to trigger various output voltage levels. The five levels are 5V, 9V, 12V, 15V and 20V. But not all chargers will supply all the voltages, even if they claim they do.

It's based on a dedicated chip with three digital inputs for selecting the voltage as a binary value. Other options can allow setting the same voltages with a resistor.

Here's how the DIP switches are set for this specific module:-

5V - All switches OFF.
9V - All switches ON.
12V - SW1-ON / SW2-ON / SW3-OFF
15V - SW1-ON / SW2-OFF / SW3-OFF
20V - SW1-ON / SW2-OFF / SW3-ON

All other combinations reverted to 5V when I tested them.

Check the output voltage after changing the switches. It's probably better to change the switch positions while the unit is unpowered.

The modern USB-C PD (Power Delivery) chargers should state which voltages they can supply, but some of the cheap clones may not be truthful about the available voltages because they don't expect people like us to actually test them.

This unit claims to be able to handle power up to 100W, but that would be 5A at 20V and I'm not sure I trust USB cables and connectors for much above 2A.

Here's a link to the item on AliExpress (not a sponsor).
This is an affiliate link, but that will not affect the price you pay.
https://s.click.aliexpress.com/e/_c43LDUEH
Cost should be around £1 each reducing with multiples.



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