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Description="Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | | | | S1 | 1 | LED | Light emitting diode | | R30 | 1 nF | Unpolarized capacitor | | | | | | | C2 | 1 | 10nF | Film capacitor | | | | | | | | | R4, R12, R13 | 3 | 1k | Resistor | | | | | R31 | 1 | 10R | Resistor | | | | D1, D2 .

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