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BackToggle .../Unseen Servant/Unseen Servant.kicad_sch | 1 | Conn_01x04 | Pin header 2.54 mm spacing | | | R31 | 1 | TL074 | Quad operational amplifier, DIP-14 | | S2 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/>