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Back| J3, J4, J5 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 KK254 Molex connector 2.54 mm spacing Q1, Q2, Q3, Q4, Q5 | 5 | 100nF | Ceramic capacitor | | | | U3 | 1 Hardware/lib/aoKicad | 1 | TL074 | Quad operational amplifier, DIP-14"/>