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Topic: Arduino nano blows up with 12v used for VIN (Read 18259 times) previous topic - next topic


12volt to 5volt is a 7volt drop.
Wise to keep power dissipation under 0.5watt for the regulator on a Nano (very little heatsink).
That is a current draw of 0.5watt / 7volt = ~70mA.
The Nano draws about 30mA, so you only have 40mA (max) left.
Not enough to power a ~80mA relay board.

See post#11.

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