Overvoltage Protection for the LM317


Posted on Apr 12, 2012

It is a voltage regulator that allows a 6v portable supply to be derived from the 12v car battery. You can add a 6.2V zener diode and a LED to warn you when the input supply is overvoltage. If you could find a relay that would operate from 6.2v right up to 12v that you could connect in such a way that if over voltage occurred, then the relay would automatically switch off the output preventing damage to any connected equipment.


Overvoltage Protection for the LM317
Click here to download the full size of the above Circuit.




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