DC Barrel Jack Adapter - Female

This adapter allows you to connect a barrel jack connector to bare wires. One end has screw terminals and the other has a 5.5x2.1mm, center-positive female barrel jack. If you have a power supply with a barrel jack and want to plug it into a breadboard, this might be the simple solution.

Please be aware that the max current for this adapter is 10A.

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Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.


Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • waaronw / about 13 years ago / 4

    I love this thing! Saves me a ton of time. My only complaint: The screw terminals are marked "+" and "-" but it would be more accurate to have them labeled as Center and Ring using the classic icon used on most wall-wart transformers. Same on the male version.

    • Member #419633 / about 11 years ago / 1

      I have been looking for this exact product for a while. Sure I could have cut apart my power adapter, but I like being able to plug it in to stuff. Besides, that would have meant dealing with stranded wire which works great the first one or two times.

      My only gripe is the + / - like you said. Labeling them center/ring would have been much more accurate. Regardless, this item is perfect for supplying power to a breadboard and I highly recommend it.

  • RIVET / about 10 years ago / 1

    Does anyone know the rating of this? Mine failed and I'm curious to if I was running too much through it (24V/6A).

    • Angrond / about 8 years ago / 1

      I can confirm that it cannot sustain a constant 21 A (based on real-life experience). I used this with the male version, first the connectors fused together (which was still OK), then a couple of hours later it became an 'open'. < ~14 A should probably be OK....

    • Betty Poprocket / about 9 years ago / 1

      Mine also doesn't seem to work, and I'm only running 5V and 12V through it. It acts like it's shorting out. I get a very quick current that dies, and when I move the power supply jack around in it to various depths, I sometimes get a full current and sometimes a partial current. I've tested my power supply on other things and it's not the problem. Neither is the breadboard I'm plugging it into. The barrel jack just isn't functioning properly.

    • Anato / about 10 years ago / 1

      6A sound a lot, you may get away with it if you use fan cooling for the connector :-)

  • Member #439862 / about 11 years ago / 1

    Kind of upsetting you have no 5.5x2.5 ones. Any plans on getting some?

  • charredgrass / about 11 years ago / 1

    Does this require any soldering? I have a 9V battery snap that I want to connect to a barrel jack, and I don't feel like soldering.

  • Since the positive and negative hookups are clearly labeled on the screw terminals it is only center positive if you hook it up that way. If you reverse the hookups (i.e. ground to (+) and positive to (-)) then it would be center(-). Just in case you had a project that needed hooked up that way.

  • Kli_Womagni / about 13 years ago / 1

    Spelling error in the title; should be "barrel", not "barrek". These (and their mate) should save me heaps of time prototyping power supplies!

  • TLAlexander / about 13 years ago / 1

    Neat! This is nicer than trying to solder wires onto a bare jack! We use this size at work and sometimes we need to wire something special up, I'm gonna get some of these!

Customer Reviews

5 out of 5

Based on 1 ratings:

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Great Gadget

I ordered this to break out a 12V wall wart into leads for an LED strip. It does the job wonderfully, The Screw terminals fit the wire coming off the LEDs, and the barrel jack means that I don't have to sacrifice a wall wart to be permanently affixed to the project.