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R24 R3, R21, R27, R28 R4, R6, R7, R30, R31 Switch, dual pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | | C3 | 1 | TL074 | Quad operational amplifier, DIP-14"/>

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