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i would never naturally assume any circuitry to be "reverse polarity" by default even if they are. since this can fry a lot of IC, and micro controllers.
there are several options to adding a reverse polarity protection circuit to your project
you can find three easy to implement circuits here:
http://provideyourown.com/2012/reverse-polarity-protection-circuits/
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∙ 11y agoThis answer is:
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Earn +20 ptsQ: Is the LM3914 IC protected against reverse polarity?
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Is there a LM3914 circuit that ranges 8 to 18 volts?
I just stopped using the LM3914, and now use a quad comparator (LM339) with a simple voltage divider. It's a little bulkier but at least it works.
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