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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?
Already great answers here about what the terminology is.
If you want my advice on what to do, I would buy a "universal AC/DC" power adapter that comes with a bunch of interchangeable barrel plug sizes and adjustable voltage. Something LIKE this: (amazon) https://a.co/d/bnlGn8I
If you set it up right, it will probably get you going again. The side benefit is that you can "guess and check" for the right barrel plugs for any you might need in the future in case anything else needs one.