I know it’s the old round pin we used for phones back in the day but can someone send me a link to the exact one because I’m seeing too many round pin charges of different sizes. Also where do I go for tech help related questions like these? Is this the right community?
It's a DC connector pin; but that's not as important as knowing the proper voltage and diameter which I couldn't say from this image and the info given.
Usually, the voltage info is written somewhere near the port, but this isn't always the case.
That’s great. I’ll try using that on the search bar.
Also be careful with polarity. Here is an article with some basics of power jacks.
https://learn.sparkfun.com/tutorials/connector-basics/power-connectors
You can order an adjustable power supply with a bunch of swappable tips on Amazon.