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Back| U3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | Tayda | A-1531 or A-557 | | J11 | 3 | 100R | Resistor | | Tayda | A-559 | | J1 | 1 | B10k | \*\*Potentiometer, 9 mm or 16 mm vertical board mount. Only 16 mm vertical board mount. Only 16 mm vertical board mount | | | | S3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | | Tayda | A-1955 | | C6, C7, C8, C9 D1, D2, D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35"/>