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R22 | 3 | 22k | Resistor | | R30 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | R9, R11, R13 | 3 | 10k | Resistor | | | R8, R10, R12 | 3 | A1M | Potentiometer | | Tayda | A-804 | | | | | | | | Tayda | A-004 | | | R4, R6, R7, R30, R31 Switch, dual pole double throw Precision Timers, 555 compatible, PDIP-8"/>

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