Probably sometimes you want to power some device from your laptop's USB or phone charger, but the device has a DC barrel power connector and there you go and make a USB A to DC barrel connector. Then, in some other day you actually need the same thing but with a micro USB, or a mini USB, or a USB B, or a thinner barrel connector, or a larger connector, or alligator clips, or a longer cable, or a shorter one, and so on... The problem is that after some time you'll end up with lots of connector converter cables and you'll still find yourself needing a different connector converter cable. Well, I'm going to share with you a simple solution to avoid making lots and lots of cables.
You'll need:
- RCA male connectors (or BNC male);
- Cables with connectors
- RCA female/female adapter (or BNC female to female adapter)

The trick is to always have a common connector in every cable that you do, which can be of several types, such as BNC, RCA or others. Besides the connectors you will also need to have the junction connectors.
If you look at the images you'll see an example using RCA connectors and RCA junctions to make a cable to convert a USB A connector to a DC barrel connector.

Step 1: Cut a cable containing a USB A connector on one end

Cut a cable containing a USB A connector on one end and strip the red (VCC) and black wires (GND).

<p>Very good usage of damaged cables!</p><p>Had a similar idea about 30 years ago... Mine was in a box and served as a cable tester/adapter for audio and video connections. ;-)</p>
<p>here's a pic</p>
Wow! Looks really neat! The indicators were to check if the positive/negative were inside/outside? :)
<p>Thank you! ;-)</p><p> The LEDs were to indicate if the cables had continuity, and if not, which conductor was broken. This box wasn't for power cables, it was for testing and adapting various audio/video cables. To be honest, I saw a similar box in a catalog. It had many more connector types and was just a tester. I made mine with the connectors I was using most and figured it could also be used as an adapter. The Cartier arrow-shaped logo in the corner is a modified rub-on logo for Archer(RadioShack). </p>
<p>This is so useful! I've made mine as just male-female pairs with no couplers because I happened to have a bunch of RCA plugs saved up. One of the power supplies I have came with a set of barrel connectors that are interchangeable. Now I can put that interchangeable output on another power supply that has different voltages than the one original power supply.</p>
<p>I made it</p><p><a href="https://pbs.twimg.com/media/BzxrTeBCcAAefOt.jpg" rel="nofollow">https://pbs.twimg.com/media/BzxrTeBCcAAefOt.jpg</a></p>
<p>awesome idea.</p>

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