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505 lines | Refs | Qty | Component | Description | Manufacturer | Part | Vendor | SKU | | | J2 | 1 | B20k | Potentiometer | | | J9 | 3 | A1M | Potentiometer | | Screws and spacers (see [build notes](build.md | | U3 | 1 | TL071 | Operational amplifier, DIP-8 | | | | | C3 | 1 | 10 uF | Unpolarized capacitor .