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| Quad operational amplifier, DIP-14 A-1135 2 8 pin DIP socket | | | Screws, nuts, and spacers (see [build notes](build.md | | | | | ----- | --- | ---- | | U3 | 1 | 10nF | Unpolarized capacitor | | Tayda | A-159 | | | | J4 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS)"/>

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