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J7, J8, J9 | 1 | Conn_01x04 | Pin socket, 2.54 mm, 1x2 (see [build notes](build.md | | R31 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/> Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | | J9 | 3 | A1M | **Potentiometer, 16 mm vertical board mount | | | R16, R18, R26 | 3 | 100R | Resistor | | | | | | | R30 | 1 Hardware/lib/aoKicad | 1 | SW_SPDT | Switch, dual pole double throw K switch sp3t ON-ON-ON D Switch, single pole double throw, center OFF position K switch spdt single-pole double-throw spdt ON-ON illuminated red green D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 | | | | | S3 | 1 | B10k | Potentiometer | .

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