Introduction: HOW TO FIND OUT WHICH WIRE HAS POWER IN a USB CABLE

Picture of HOW TO FIND OUT WHICH WIRE HAS POWER IN a USB CABLE

I checked it out @ Techshop

Quick answer: RED and BLACK

Step 1: First, You Will Need to Find an Used USB Cable, a Multimeter and a X-acto Blade.

Picture of First, You Will Need to Find an Used USB Cable, a Multimeter and a X-acto Blade.

(You can't see but the red and black wires are already peeled, may be someone tried before me to extract power from this cable)

Step 2: Then You Need to Peel the Wires

Picture of Then You Need to Peel the Wires


Step 3: Connect Your USB Cable to a Computer

Picture of Connect Your USB Cable to a Computer


Step 4: With the Multimeter Start to Hunt for Which Pair of Wires Measures Around 5V.

Picture of With the Multimeter Start to Hunt for Which Pair of Wires Measures Around 5V.


Step 5: It Is ... the BLACK and RED Pair

Picture of It Is  ...  the BLACK and RED Pair


Step 6: Now Go Find a USB Female Port

Picture of Now Go Find a USB Female Port


Step 7: Cannibalize the Circuit

Picture of Cannibalize the Circuit


Step 8: Take Out the Plug

Picture of Take Out the Plug

Fit the female plug into your power source

(the USB cable has 4 wires, and in this case the 2 outside wires were the power ones)

Step 9: Weld and Isolate Everything Together

Picture of Weld and Isolate Everything Together


Step 10: And Done :) This Was Done at Techshop

Picture of And Done :)  This Was Done at Techshop

Comments

MuhdR3 (author)2015-12-22

what we can do with the remaining wire the white and the blue wire

DjordjeD1 (author)MuhdR32016-04-23

That are DATA+ and DATA- wire... Simply nothing. Only if you know what are you doing.

The Dark Lord (author)2013-05-23

Good idea! Thank you for the information.

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