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R13 | 3 | 10k | Resistor | | U1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/> 100V 0.15A standard switching diode, DO-35 Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm pots, you're on your own! The.

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