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BackPin header, 2.54 mm, 1x2 (see [build notes](build.md | | | | J3 | 1 | LED | Light emitting diode | | R17, R19 | 3 | A1M | \*\*Potentiometer, 9 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | S2 | 1 | 10 nF | Unpolarized capacitor | | | C3, C4, C11 | 3 | 10k | Resistor | | | R9, R11, R13 | 3 | A1M | Potentiometer | | | | R1, R2, R23, R24 R3, R21, R27, R28 | 3 | 10k | Resistor | | Tayda | A-1121 | | S1 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x4 | | C10 | 3 | A1M | Potentiometer | | | | | R30 | 1 | B10k | Potentiometer | | R30 | 1 | SW_DPDT_x2 | Switch, single pole double throw, separate symbols"/>