Portable USB Charger




Introduction: Portable USB Charger

well this is a DIY portable USB charger  for this you need  1    Female USB cord.    1   voltage  regulator 5V

wires, solder, a small  box , a switch , and a Hot glue gun.    1   LED  1   Resistor 220 ohms, and   two 100 ohms Resistors

Cut the USB cord you will see 4 wires ,one RED, one White/blue , one  Green/yellow, and one Black.

Place the Vol Reg facing you. the 1st leg from L to R  is input,  the middle is GND, and the last is 5V  out

lets call them A.B,C   from L to R
connect the battery  POS to  leg A. 
The Red Wire from the USB Goes to Leg C
The two remaining wires from the USB, Each gets  a 100 ohms Resistor ,  and  then connect to Leg C

The BLACK wire from the USB goes to Leg B  

The Red & Black wires from the Power supply  " 9 v Batt" Get  Connected to each terminal of the Switch.
The LED With the Resistor on the Shorter leg  goes to Ground. And the other Goes to Positive.

I made two of these. the 1st Did not worked  .arrrggggg
the Second did work  Yeah......
Question for anyone my 9 V battery gets very Hot  so hot that i had to pull the plug.  it gets hot while unit is off. any ideas
 Since posting this.. I have Removed the LED  Now   its  Connected Directly to the 5V Regulator.
And Guess What??? The battery Still Over Heating.......
I put a Diode Between The Power " Batt" and The Switch  on the + wire.
Battery  Still Heating Up.?????????????

Update I am No longer using this   its a small Paper Weight.

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    The 100 Ohm resistors are insufficient to charge an iPhone 5/5S.

    Why? The iPhone 5/5S expects a signal on the data lines to indicate it can draw current to charge - just supplying 5V is insufficient. You need something in the likes of 2V on D+ and 2.7V on D-.

    Take a look at this instructable for more information.


    8 years ago

    You probably have a short in the circuit. If your switching the + side of the battery then it would be closer to the batt. Check that the terminals are not shorting somewhere. Make sure it's clean inside and when you close it up nothing is shorting out.

    As far as the circuit is concerned, there is no reason why the battery should be heating up unless your circuit is different from the one shown (like what russ_hensel said). You may want to remove the circuit from the project box and lay it out so people can visually troubleshoot the circuit.


    8 years ago on Introduction

    If battery is getting hot while the unit is off then you have not built the circuit shown in the schematic ( unless you left the unit on the stove ).

    A clean up of the text ( items like CAPITILIZATION and... ) would be a nice improvement.