USB Type C 3.1 PD to 5.5mm Barrel Jack Cable - 15V 5A Output - 1.2m long with E-Mark
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This cable will let you get rid of all those wall adapters you have stashed in the plastic bin in the basement. Instead of multiple wall warts with different power and current capabilities, this cable will convert any USB Type C power adapter with Power Delivery (PD) support into a 9V DC power port, at up to 5 Amps output!
Inside the cable is a PD sink negotiation chip. When plugged into a proper PD Type C adapter that can provide 15V it will chat with the PD source chip in the power supply and tell it "Hey please change your output to 15V thankyouverymuch!", and ta-da, you get 15V out on the DC barrel jack.
Do check the side of the adapter you are plugging into to make sure it is a PD source - the voltage and current capabilities will be listed on your adapter. We have a demo image up top for what it will look like if it can support the desired output.
Note it is not a boost or buck converter - if the power supply only can do 5V or 20V it will not magically convert it to 15V - we do have USB booster cables if that's what you want. Voltage output will often be 0.25V to 0.5V higher than the rated voltage so that at high current draw the voltage drop across the cable will still keep it at about the desired voltage at the tip.
This cable includes an EMARK chip, required by the USB C specification but sometimes left out. That means you can use this for high current (5A) charging / power delivery. These are also especially souped-up USB Power Delivery cables, meaning they're suitable for a swath of demanding devices, like laptops.
This cable is 1.2 meters long, so you get just the right amount of length for your project. Also comes with a velcro tie to keep it nicely coiled and neat. Tip is 5.5mm outer diameter, 2.5mm inner diameter but it's springy so it works just fine for 2.1mm as well.