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A-1157 or A-2425 | | | | Tayda | A-553 | | L1 | 1 | TL071 | Operational amplifier, DIP-8 | | | | | | | | Tayda | A-159 | | Tayda | A-553 | | | R21, R22, R23 | 3 | 22k | Resistor | | | R4, R12, R13 | 3 | A1M | Potentiometer | | C1 | 1 | B10k | \*\*Potentiometer, 9 mm or 16 mm vertical board mount OR: **Potentiometer, 16 mm vertical board mount OR: | | | | U1 | 1 README.md | 29 aoKicad | 2 | 10k | Resistor | | D1, D2.

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