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C11, C12 | 3 | 100R | Resistor | | | | | R24, R26, R28 | 4 .../precadsr-Edge_Cuts.gbr | 30 .../precadsr_aux_Gerbers/precadsr-F_Mask.gbr | 266 .../precadsr_aux_Gerbers/precadsr-F_Paste.gbr | 15 .../PCB/precadsr_Gerbers/precadsr-F_SilkS.gbr | 128 .../PCB/precadsr_Gerbers/precadsr-NPTH.drl | 4 .../PCB/precadsr_Gerbers/precadsr-F_Paste.gbr | 15 .../precadsr_panel_al-F_Mask.gbr | 47 .../precadsr_panel_al-F_Paste.gbr | 15 .../precadsr_aux_Gerbers/precadsr-B_SilkS.gbr | 1093 .../precadsr-Edge_Cuts.gbr | 30 .../precadsr_aux_Gerbers/precadsr-F_Mask.gbr | 185 .../precadsr_aux_Gerbers/precadsr-F_Paste.gbr | 4 | 100nF | Unpolarized capacitor | | | C1, C11, C12 | 1 | SW_Push | Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | | | J5, J12, J13 | 3 | 10uF | Polarized capacitor | | | | | Tayda | A-157 | | | | | | R9, R11, R13 | 3 | 4.7k | Resistor | | R15, R17, R19 | 3 | A1M | **Potentiometer, 9 mm vertical board mount 3PDT miniature toggle switch ON-ON | | J5, J12, J13 | 3 pin Molex header 2.54 mm spacing | Tayda | A-826 | | L1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | R25, R27, R29 | 3 | 1k | Resistor | | | | J3 | 1 | SW_SPDT | Switch, single pole double throw | | | | | | J12 | 1 | 3_pin_Molex_connector | 3 | A1M | \*\*Potentiometer, 9 mm or 16 mm vertical board mount | | J8 | 1 | AudioJack2_SwitchT | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | C3 | 1 | 10R | Resistor | | Tayda | A-553 | | | S1 | 1 | Conn_01x04 | Pin socket, 2.54 mm, 1x4 | | C2 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md | | | | | | Tayda | A-1157 or A-2425 | | Q1, Q2, Q3 | 3 | AudioJack2 .

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