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BackBy an op amp Add kicad schematic, some diylc noodling .../Unseen Servant/Unseen Servant.kicad_pro | 2 Synth Mages Power Word Stun provides ensmoothened ±12V with 6 positions D Switch, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | | | R5 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14"/>