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BackSwitches 1 rotary switch - 7mm, with 3-4mm extra space micro toggle switch ON-ON | | | | | | C1 | 1 | 10nF | Unpolarized capacitor | | | | | | Tayda | A-3545, A-3489, or A-3499\*\*\* | | | Screws and spacers (see [build notes](build.md)) | | | R31 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14"/>