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J8 | 1 | 1 | LED | Light emitting diode, 5 mm | | | | J1 | 1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | | | R9, R11, R13 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN.

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