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Can't find a 7.4 x 5.08mm female chassis mount socket - am I using the wrong description? (discuss.tchncs.de)

submitted 1 year ago by [email protected] to c/[email protected]

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I have a 12v 6.67A power supply with a male co-axial plug (with centre pin) that's 7.4mm OD and 5.08mm ID. The metal tube is 12.5mm long.

The pin is recessed and about 1mm in diameter - which seems impossibly small for 6.67A.

A chassis mount socket that would take it would come in handy. But I don't seem to be able to find one. Am I just using the wrong search terms?

Any pointers much appreciated.

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[–] Krististrasza 1 points 1 year ago (1 children)

The pin is recessed and about 1mm in diameter - which seems impossibly small for 6.67A.

Because it doesn't carry 6.67A. What you have there is a laptop power supply, probably an HP or Dell one. The current is carried on the inner and outer sleeve of the barrel. The centre pin only carries communication signals.

[–] [email protected] 1 points 1 year ago (1 children)

Nope, good guess, but the power supply is from a Philips Respironics Dream Station https://www.cpap.co.uk/product/dreamstation-80w-power-supply/

But you are correct - there does seem to be a recessed metal inner sleeve. I had looked for one, but couldn't see one - tried again after your post (with a brighter light!)

I still need a chassis mount socket for it, though....

There is a 12v car lead - which makes me wonder if that centre pin is actually used at all...

https://www.lps-gopower.org/12v-philips-respironics-dreamstation-machine-267p-car-auto-dc-travel-charger-99735.htm

[–] Krististrasza 2 points 1 year ago (1 children)

I guess you could check if it's a physical fit for an HP (or Dell or Samsung) one and then go to ebay or aliexpress and buy a corresponding "laptop charger socket". Though they're all board mount. I don't know if any panel mount ones even exist.

[–] [email protected] 1 points 1 year ago

Thanks for the suggestion - I think that there are inline adapters to a different plug, but finding a different coaxial plug that will handle that current could prove challenging.