Dual Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14"/> Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x10 Pin header, 2.54 mm, 1x4 | | J11 | 3 | 4.7k | Resistor | | | R4, R6, R7, R30, R31 | 1 | SW_SPDT | Switch, single pole double throw D Switch, single pole double throw, separate symbols | | | C3 | 1 | B10k | \*\*Potentiometer, 16 mm vertical pots. You can even use a raspberry pi zero through hole M2, height 3.5, Wuerth electronics 9775041360 (https://katalog.we-online.com/em/datasheet/9775041360.pdf), generated with kicad-footprint-generator Hirose series connector, B8B-XH-AM, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST XH series connector, BM07B-ZESS-TBT (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator Soldered wire connection, for a in.