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BackGeneric K switch normally-open pushbutton push-button D MEC 5G single pole double throw, separate symbols | | | Q1, Q2, Q3 | 3 | A1M | Potentiometer | | R9, R11, R13 | 3 | 1k | Resistor | | | | R14 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8