Electronics > Beginners
Simple phase sequence detector using NAND gate
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soldar:
Good find! The optocouplers are definitely a good idea although not needed if the device is properly isolated. But better safe than sorry.

OTOH, you could probably easily design it to take the power from the wires themselves.

I really have no need for this because I do not use three phase but if I did I would definitely put this on my list of projects.

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