Re: "Barrel" connectors

On 16/06/2025 18:18, Crash Gordon wrote:

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.

It should be possible to make an adapter using the chip from a
cannibalised Dell PSU.  I intend to try this.
However, newer Dell notebooks use USB-C for power, so the problem has
mostly gone away.
John