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  • SidhT commented on Salman Naveed's instructable Simple Polarity Checker9 months ago
    Simple Polarity Checker

    when probe is in positive, red led will light up. when probe is in negative green will light up an red will be off. for me this circuit is better because it will not confuse me, every time red led is on this means that lead is positive and vice versa. :) in ac both led will light.

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