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C4, C10 | 1 | B20k | Potentiometer | | | | | C10 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch ON-ON | | J8 | 1 | TL071 | Operational amplifier, DIP-8 | | | | | | Tayda | A-1157 or A-2425 | | C6, C7, C8, C9 | 5 | 100nF | Ceramic capacitor | | R4, R6, R7, R30, R31 Switch, dual pole double throw K switch spdt single-pole double-throw spdt ON-ON D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | Tayda | A-804 | .

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