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From: Crash Gordon <uucp@crashelex.com>
Newsgroups: sci.electronics.design
Subject: Re: "Barrel" connectors
Date: Mon, 16 Jun 2025 12:18:17 -0500
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On 6/16/2025 12:07 PM, KevinJ93 wrote:
> Some Dell notebook power supplies have used that approach.
> ...
> Be careful with Dell supplies. Modern ones may be different this is from 
> ~15 years ago

They still do this.

Interestingly, Dell and HP use compatible "Big Barrel" and "Small 
barrel" power connectors.  The voltage and polarity are the same.  A 
Dell adapter will work just fine on an HP laptop, because the HP does 
not use the third pin to identify the adapter.  However a Dell laptop 
will complain about an HP adapter because it cannot read any identifier 
on the third pin.

-- 
I'm part of the vast libertarian conspiracy to take over the world and 
leave everyone alone.