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Ruby circuit source title "LED circuit" board :half supply :USB, voltage: 5, plus: "T+1", minus: "T-1" resistor :R1, "330", pins: %w[a10 a12] led :D1, color: :red, anode: "b12", cathode: "b13" wire "b10", "T+2", color: :red wire "c13", "T-2", color: :black

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