Travel Technology - 3 prong headphone sockets

Does anybody know the power-ratings of that 3rd (2.5 mm / 1/10") socket you see on many airline's arm-rest headphone sockets (KLM, CX and others have 'em) :confused:

I was able to determine from searching the 'net that it is the power socket for the NR/NC headsets, and that the tip=Power+ and sleeve=Power-, but no actual powerratings... :(

TIA!

CescoAiel, this subject might be better handled in our Travel Technology Forum so we're shifting it there.

Thanks.

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Cholula

CommunityBuzz! Co-Moderator

Wouldn't that blow out any earphones that are accidentally plugged in to it? I know most plugs are 3.5mm, but I have a couple of sets that use the smaller form factor.

Reminds me of the first IBM PCs. They had two identical 5-pin DIN jacks on the back, one for the cassette recorder and the other for the keyboard. If you plugged your keyboard into the cassette jack by mistake, it would cost you $200 - for a new keyboard.

The 2.5mm form factor is used for cell headsets usually.

What this might be interesting for is to power/charge a small device (iPod, phone, etc) through a homemade cable. Depends on what the power rating for the outlet is, though - if it's only supplying 10 mA at 3V, it's not going to be too useful. 125mA at 5V, and you're getting somewhere.