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| A-553 | | | R4, R6, R7, R30, R31 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 | | J3, J4, J5 | 3 | 10k | Resistor | | | C3, C4, C11 | 3 | 10uF | Polarized capacitor | | Tayda | A-4349 | | R1, R10, R11 | 3 | A1M | Potentiometer | | | ----- | --- | ---- | | R3, R21 | 2 | 47k | Resistor | | R9, R11, R13 | 3 | 1k | Resistor | | C7, C12, C13 | 3 | A1M | Potentiometer | .

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