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BackSocket A-001 1 14 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see [build notes](build.md)) | | | | | | | U1 | 1 | LED | Light emitting diode | | | | R109, R111, R113 | 3 | A1M | Potentiometer | | | | | Tayda | A-3186 | | R30 | 1 | | | | | L1 | 1 | Conn_01x04 | Pin socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x10 | | S3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/>