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| TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/> Quad operational amplifier, DIP-14 A-1135 2 8 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see [build notes](build.md | | 4 | 100k | Resistor | | | | | R30 | 1 uF | Polarized capacitor | | | Q1, Q2, Q3 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS)"/>

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