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| R3, R21, R27, R28 | 3 | 100R | Resistor | | | | | C3, C4, C10 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x4 | | U1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14 | | Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 | 4 | 1M .

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