Step 6Using an old mobile phone charger
Cut one end about 25mm shorter than the other. It does not matter which end. Strip some of the insulation back like about 3mm and put solder on the ends.
Solder your string of resistors to the shorter bit of the cable.
I am not sure if there is much difference between chargers but you want something that is between around 5 and 9 volts. If you look closely on the charger it will have a number followed by a V. That is the number to look for.
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