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(Defacto) standard DC barrel connectors
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magic:
Same here, mostly a random mix of 5.5/2.1 and 5.5/2.5, except that the lowest 5.5/2.5 I have seen was 1A exactly.
DC and AC.

Space constrained devices sometimes used smaller connectors with 3~4mm outer diameter.
nctnico:
Then again, if the OP is looking to design a product it could be worth considering using USB-C and a small chip that negotiates the required supply voltage.
coppice:

--- Quote from: Monkeh on January 11, 2024, 02:33:12 pm ---Japan has a standard: https://en.wikipedia.org/wiki/EIAJ_connector

Nobody else takes any notice.

--- End quote ---
That seems to be the only standard that links the power connectors it defines to their application - i.e. which way around to polarise them, what the voltage is, etc. Its a pity they are not more widely used. Even the Japanese don't use them that widely.
Siwastaja:
There is no standard, not even de facto. If you want to use a barrel connector in your product, you just write in the manual that only the supplied adapter is allowed and using anything else voids warranty, and then you let users either be careful choosing the right voltage and polarity, or kill your product and (hopefully) learn from that.

Luckily, with USB power everywhere, DC plugs are rarer today and as such, users are less likely to pull any random power supply and try to use it with your product instead of your supplied adapter.
coppice:

--- Quote from: Siwastaja on January 12, 2024, 07:31:32 am ---There is no standard, not even de facto.

--- End quote ---
Get with the program. Two of us just referenced a real standard. There is one. Few people follow it. There are also de facto standards. Find a CCTV camera that doesn't have the same connector with the same polarity and 12V requirement as the rest. If you can it will be a strange outlier, or something specialist with unusual power needs.
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