this post was submitted on 25 Nov 2025
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Maker David Johnson-Davies has designed a compact board for anyone looking to turn a USB Power Delivery (PD)-capable power supply into a user-selectable fixed voltage for their breadboard projects and more: the USB-C Power Delivery Dongle.

"This is a small board that will deliver one of six fixed voltages from a USB-C power adapter that supports [USB] Power Delivery," Johnson-Davies explains of the gadget. "It's compact enough that you can put it in line with a USB-C cable, encapsulated in a small case or heatshrink tubing, and you can select the voltage by soldering a wire link or fitting a jumper in one of six positions. A green LED indicates when the output is active."

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[–] cmnybo@discuss.tchncs.de 3 points 2 days ago

One thing these adapters are usually missing is a status pin to tell you if it successfully negotiated the requested voltage and current.