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Pins Schottky Barrier Rectifier Diode, DO-41 D3, D4, D5, D6, D7, D8, D9, D10 Standard switching diode, DO-35"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | J3 | 1 nF | Unpolarized capacitor | | | R30 | 1 | SW_SPDT | Switch, triple pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Small Signal NPN Transistor, TO-92 | | | R31 | 1 | SW_Push | Push button switch, generic, two pins | Dailywell | PAS6B3M1CESA3-5 or PAS6B3M1CESA2-5 | Tayda | A-1955 | | Screws, nuts, and spacers (see [build notes](build.md | | R30 | 1 .

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