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D Single Pole Single Throw (SPST) switch D MEC 5G single pole double throw, separate symbols K switch normally-open pushbutton push-button D MEC 5G single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS *(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md | | Tayda | A-1531 or A-557 | | | | S1 | 1 nF | Unpolarized capacitor | | S3 | 1 | TL074 | Quad operational amplifier, DIP-14

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