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  • linalt commented on Bits4Bots's instructable Simple Touch Switch 3904 NPN1 month ago
    Simple Touch Switch 3904 NPN

    The led doesn't light up when I am touching the green wires but light up when I touch the green wires to each other. What is a possible issue? I am using all the same parts except I am using a 9v battery instead of a 5v. Thank you.

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