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Back| 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 | 4 | 100k | Resistor | | | | U3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14"/>