Re: "Barrel" connectors

On 6/16/2025 2:57 PM, John R Walliker wrote:

It should be possible to make an adapter using the chip from a
cannibalised Dell PSU.  I intend to try this.

A number of years ago, while working for a company that repaired laptops, I built a jig using a 190W Dell power adapter, and a switch to select which ID chip to connect to the third pin.  So we could test the ability of the laptops to ID specific adapters.  The one-wire protocol is not difficult and I considered using a microcontroller to spoof the various messages, but we had lots of adapters with bad cables so it was easier to rob them for the part.
I did build a gizmo that would read the ID, so we could test adapters before shipping them back to the customer.
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I'm part of the vast libertarian conspiracy to take over the world and leave everyone alone.