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Mm spacing Pin header 2.54 mm spacing Q1, Q2, Q3 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x10 Pin header, 2.54 mm, 1x10 | | R4, R6, R7 | 3 | 1k | Resistor | | S3 | 1 Hardware/PCB/precadsr/sym-lib-table | 3 | 10uF | Polarized capacitor | | | | | | R9, R11, R13 | 3 | 2_pin_Molex_header | KK254 Molex header 2.54 mm spacing D Switch, three position, single pole double throw K switch sp3t ON-ON-ON D Switch, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | C1 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | | | | | J2 | 1 | Conn_01x10 | Pin header, 2.54 mm, 1x4 | | | | R24, R26, R28 | 3 | 4.7k | Resistor | | | | | Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 R3, R21, R27, R28 | 3 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch | Dailywell | PAS6B2M1CESG2-5, PAS6B2M4CESG6-5, or PAS6B2M4CESG6-5 | Tayda | A-559 | | | | | | | L1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | | | R4, R12, R13 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) 100V 0.15A standard switching diode, DO-35 Schottky Barrier Rectifier Diode, DO-41 Switch, triple pole double throw | | R15.