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Lib="Amplifier_Operational" part="LM2904"> Dual Operational Amplifiers, DIP-14/SOIC-14 | | J10 | 1 | Conn_01x10 | Pin header, 2.54 mm, 1x4 | | U3 | 1 | 4.7 uF | Polarized capacitor | | J7, J8, J9 | 3 | A1M | Potentiometer | | | | R3, R21, R27, R28 R4, R6, R7, R30, R31 | 1 | Conn_01x07 | *(optional) SIP socket, 2.54 mm, 1x2 (see.

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