Question 1

I want to buy a usb to 5V barrel tip power supply cord.  Cords have Alpha designations (H, L, M, N, etc.) but not dimensions of the barrel tip.  The tip I need is about 3-4 mm in diameter and about 10mm in length.  How to I match dimensions with alpha types?

Accepted Answer

The wikipedia article on "Coaxial Power Connectors" has a pretty good table matching dimensions and Adaptaplug designations, which I assume to be the same. It gives an Adaptaplug H as being 3.4 mm outer and 1.3 mm inner diameter, which matches the cable I have reasonably well.

The inner diameter is equally important if you want the cable to fit properly, by the way.

Question 2

What is the polarity of the barrel connector? Please specify if the barrel is positive or negative.

Accepted Answer

Center +
outer barrel -

Question 3

Got this cable, but barrel is too large. Is there a smaller size made - like ~2.5 mm OD?

Accepted Answer

All standard sizes are available but you might have to hunt for them.

Question 4

Can I use this cable to power a Sony CD Walkman from a "Power All" battery bank?

Thanks

Accepted Answer

Really do not know.  We use it on a Sony photo  display panel at our show booth.  It worked just fine in that application.

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