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| Conn_01x02 | SIP socket, 2.54 mm, 1x2 (see build notes) 1 SIP socket, 2.54 mm, 1x4 | | | | | | | | | C3, C4, C11 | 2 | 10k | Resistor | | | J9 | 1 | TL071 | Operational amplifier, DIP-8 | | J12 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | | | | | | | | | R4, R6, R7, R30, R31 | 1 | TL074 | Quad operational.

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