Ultra-Portable Micro Usb Charger With Strap




Introduction: Ultra-Portable Micro Usb Charger With Strap

About: A physicist with good knowledge in electronics and programming.

Is your phone battery running low and you are far from your charger? Not any more. You can create your own ultra-portable charger by modding an iphone charger. Keep your phone charged wherever your are, simply by adding your charger to your keys.

Step 1: Opening the Iphone Charger and Desoldering

First of all, you must have a basic knowledge of electronics and how to use a soldering iron. I don't have any responsibility if you harm yourself by modding your charger.

Ok, now open your charger and desolder the C4 capacitor, the D2 diode ,the ZD1 zener diode, the four resistors below the USB connector (R0, R6, R7, R8) and the USB connector itself. We won't resolder those four resistors but take care of the rest of the components that we desoldered.

Step 2: Cutting and Resoldering

You have to cut the piece of the pcb where the usb connector was placed. Solder the ZD1 and D2 like in the photos (watchout for the polarity). Solder a piece of wire to the positive leg of the capacitor in order to make it longer. Now solder the capacitor like i did in the photos and add the jumper that i forgot (black line).

Step 3: Creating the Case

After you have finished cutting and resoldering, find an old power supply and cut the AC connector from its base. Trim the connector like in the photos, plug it to your charger, cut a piece of a flat heat shrinking tube and heat it until it forms to the shape of the connector and the charger.

Step 4: Connecting Everything Together

I was able to install a 30cm long cable to my charger (cutted from an old IDE pc cable and soldered into a micro usb male connector) but you can also try other types of cables (watchout of the charger's 1 Ampere). Plus goes to the D2-C4 connection and minus to the jumper that we added. After cutting the plastic case of the iphone's charger with your dremel, use 1mm PVC and aluminum ,or other type of tape, in order to achieve a smoother result. Add a strap to your charger and there you go, you got an ultra-portable charger that measures 52x35x14 mm and has a 30 cm wire.

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    8 years ago on Introduction

    Just be careful when hacking such things into smaller cases, especially at line side. There are these things called clearence and creepage distances, which every professional developer hates, beacuse there are strict regulations defined in the specific product standards. So when you reduce these clearence and creepage distances it is likely to risk a flashover, which could lead to dangerous situations for the user and the stuff around it.

    But at the first look, I think here only the USB side has been hacked, which has only 5V, which isn't that dangerous compared to the line side and you also used some additional insulation tubes. So I think that should be fine, I just wanted to make a quick reminder concerning these topics... ;)


    Reply 6 years ago

    I was about to mention clearance distances, but is mod in particular is incredible well thought through and the risk of an electric shock should be very low. I'd not trust that coverhanging capacitor though, the optocuppler is there for a reason. I'd at least add a piece of krepton tape for better insolation.


    8 years ago

    Really good! Fantastic idea!