USB chargers are one of the most popular things to build here on Instructables. However countless people have been disappointed to find out that after all of their hard work, their iPod just sit there and do nothing, despite receiving 5V.You can look at the amperage on the charger but 1000 ma is good for normal USB devices and 2200 ma can be used to charge most tablets. One thing to keep in mind is sometimes you have to bias the data lines. You need to do this because some devices are made to only accept a charge from a computer or special chargers.
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