AC adapter barrel plug size?

Hi @markc33597

Just verifying that you want to connect the DC-In jack to a USB-C cable so that you can charge the speaker using an adapter that has Power Delivery type USB-C output e.g. 33W USB-C adapter, is this correct?

Not that easy to do as the speaker requires 16V/2A DC to be supplied on the DC-In port which is possible with USB-C Power Delivery (up to 20V/5A) but since the DC-In jack only has a two wire connection you would have to contrive a circuit to signal the adapter that it should supply the required amount of voltage and not just the standard 5V. You could do this in the adapter but then it wouldn't be able to be used for anything else as it would be a fixed arrangement and not variable depending on what else it was connected to, assuming that the USB-C cable could be unplugged from the adapter and another one inserted in its place

Here's a link that shows the USB-C pinout and explains about the Power Delivery setup between two devices, host and peripheral using the CC1 and CC2 wires in a USB-C cable.