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Back2.54 mm, 1x4 | | | | 14 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x7 Pin socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | J1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | J2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>