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Back| Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x2 (see [build notes](build.md | | R21, R22, R23 | 3 | 10uF | Polarized capacitor | | | | Q1, Q2, Q3, Q4, Q5 | 5 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | | | Tayda | A-804 | | U2 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/>