Step one: strip off the shielding and insulation on an inch or so of the usb
cable. Clip the white and green cables to uneven lengths so they can’t
conduct into each other or either of the power lines. Hopefully you should
be left with a black wire and a red wire.
Step two: Clip off a length of the nokia chargers phone-side plug. You
won’t be needing the wall wart part anymore. Strip off the insulation from
the nokia plug wire. Hopefully you should have a red wire and a black one.
the red wire should be connected to the inner barrel of the plug, and the
black one should be connected to the outer barrel.
Step three: Attach a normal silicon diode (not a zener diode) with the line
part towards the nokia plug. It should go between the red wires from both
cables (see image). Attach the black wires from each cable together.
I suggest staggering the lengths of the wires so that the solder joints have
less chance of coming into contact.
Check all the wires with a multimeter to make sure they are really the right
ones! The colors might not be standard
Thnanks for the internet
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