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Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TSSOP-8/VSSOP-8 Audio Jack, 2 Poles (Mono / TS)"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Audio Jack, 2 Poles (Mono / TS) | | R2, R5 | 2 | | U3 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | | Tayda | A-1157 or A-2425 | | | | | Tayda | A-3588 | \** Use only four.

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