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will a 3v 1a mains adapter work for a 3v 20ma led without any burning out? Answered

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4 years ago

You can probably get away with powering it directly if the output of the supply is exactly 3V no higher. You should use a current limiting resistor (about 47 ohms minimum, ~200 ohm prefered.) to prevent too high a current.

In my tutorial video, I discuss powering LEDs in more detail.