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Back.../ao_tht.pretty/Perf_Board_Hole.kicad_mod | 16 .../precadsr_aux_Gerbers/precadsr-F_Cu.gbr | 580 .../precadsr_aux_Gerbers/precadsr-F_Mask.gbr | 185 .../precadsr_aux_Gerbers/precadsr-F_Paste.gbr | 4 | 47k | Resistor | | | | | L1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md | | J6 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | R23, R24, R25, R27 Switch, triple pole double throw, separate symbols K switch dp3t ON-ON-ON D Switch, single pole double throw, separate symbols K switch triple-pole double-throw DPDT 3pdt ON-ON D Screw terminal, single row, 01x03 D 2x5 pin shrouded header 2.54 mm spacing D Switch, dual pole double throw, separate symbols