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1x4 Pin header, 2.54 mm, 1x4 | | | | U3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | C10 | 1 nF | Unpolarized capacitor | | | | | | | | | R3, R21, R27, R28 R4, R6, R7 | 2 | 1M | Resistor | | | Tayda.

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