If you are having a mobile phone charger you can easily make a adapter supplying a low voltage.I am having a NOKIA AC-2N charger and it's output is approximately around 5.3v.You can use any mobile phone charger but first see it's output voltage.At first, plug in the charger.
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Step 1: Step 1
Attach a paper clip over the socket as shown.Connect a wire.This is your negative terminal supplying 5.3v.
Step 2: Step 2
Insert a pin inside the socket ,this makes your positive terminal. Be careful about inserting the pin make it as soft as you can.Run any device for testing your new adapter.
Step 3: Enjoy..........
Enjoy with your new adapter but avoid short-circuiting the wires for it will reduce the charger's life.