Laptop power supply "Smart Pin" ?

Hi All,
I'm an electronic hobbyist and wanted to use a surplus HP laptop power supply as a power source
for my experiments.  It is a large 'brick' rated at 18.5VDC @ 6.5AMPS, I think (sorry I'm at
work).  When  I cut off the DC plug I was surprised to find a COAX type cable with 2 shields and
a center conductor.  After a little surfing I 'assumed' that the third wire is the center
conductor, or the smart pin.  Cannot seem to find how the "smart pin" works.  Anyone know of a
link as to how this works so I can be "smart" about using this power supply?  All I'm looking
for is some nice, regulated DC.
Buy the way, I own 3 HP laptops and administer hundreds of HP servers at work.  Wouldn't buy
anything else!
Thanks...

Hello friend, ignore those websites just cut your hp charger, u will see 3 wires which are the first layer, second and third. Cut off the third layer to prevent shunting cause it almost damage my laptop. Connect your positive to the second layer and negative to the first layer and that solves the problem. Can also be used on dell laptop chargers too. Tested and confirmed. Don't forget to cut of the third layer first. Kudos

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