USB Cellphone Charger Cable

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About: Graduate student at the MIT Media Lab.

I have a recently moved to the US, but my cellphone charger has a British plug. Therefore I have use an adapter, which makes the whole thing very cumbersome to carry around. As I always have some USB outlet like my laptop around anyways, I got the idea to make a USB version for charging the phone.

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Step 1: Check the Power Adapter Voltage

Check what voltage the power adapter generates. For my Samsung model it is 5V DC, which is just what we want.

Step 2: Cut the Cables

Step 3: Check Voltages

Step 4: Soldering

The little black insulating pieces are heat shrinkable tubing, which is very convenient. Just don't forget to put it on there.

Step 5: Charge Phone

Hooray, it works!

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    7 Discussions

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    corpseprodder

    10 years ago on Introduction

    Is 5.3v always to be expected form a usb out or is there any way to < or > the voltage output. Or is this a daft question?

    1 reply
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    According to the specification of USB, you get 5 V±5% with 100 mA per device from a port. However, your cellphone might require a different voltage, so best check the power supply first. It should state the voltage on a label.