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BackOp amps and otherwise a bunch of wires backwards Fix floating pin for op amp Add kicad schematic, some diylc noodling Add kicad schematic, some diylc noodling .../Unseen Servant/Unseen Servant.kicad_sch | 864 Schematics/Unseen Servant/fp-info-cache | 399 2 5mm LEDs -Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp