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D5, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Dual Operational Amplifiers, DIP-14/SOIC-14 | | | | Tayda | A-3588 | \** Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount OR: | | | Screws, nuts, and spacers (see [build notes](build.md | | | | S3 | 1 | SW_3PDT_x3 | Switch, dual pole double throw, separate symbols | | | | | | S1 | 1 | TL071 | Operational amplifier, DIP-8 | | | Tayda | A-827 | | | C2, C5.

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