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.

Brand	StarTech.com
Model	USB2TYPEH
Type	Consumer Electronics
Color	Black

StarTech.com USB2TYPEH Black USB to 3.4mm power cable - Type H barrel

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Connector Number	2
Connector Detail	1 - USB A (4 pin) Male to 1 - Barrel Power Connector (Size H, OD: 3.40, ID: 1.30)

Item#: N82E16812400048