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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?
Looks like a barrel plug. These are very common and finding s as replacement should be easy. On the underside of the lamp there will be writing that says what the electricity requirements are. e.g. 12V—-400mA Look up a replacement using those numbers.
One thing to remember is that the Voltage needs to be exact, but the supplied Amperage can be equal or higher then the original power supply.
So if you are trying to replace an originally 12v 400mA power supply you can also go with a 12v 500mA or 1A (1000mA) power supply. But 12V 200mA probably won't work and for example 19V 400mA might outright destroy your device.