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Quad operational amplifier, DIP-14 | | R3, R21, R27, R28 | 3 | 1k | Resistor | | Tayda | A-3545, A-3489, or A-3499\*\*\* | | R4, R12, R13 | 3 | A1M | **Potentiometer, 16 mm vertical board mount | | C12 | 1 | 1 | TL071 | Operational amplifier, DIP-8 | | | | Tayda | A-1605 | | | R8, R10, R12 | 3 | A1M | Potentiometer | | | | | | | | Taydaa | A-4755 | | | | | | | | R20, R22 | 2 | 1N5817 | Schottky diode | | Tayda | A-805 | | | | | R24, R26, R28 | 3 | 1k | Resistor | | | | | J2 | 1 README.md | 8 | 1N4148 | 100V 0.15A standard switching diode.

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