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The timing capacitors. \*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | Tayda | A-1121 | | | | | | | J1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | | L1 | 1 | SW_Push | Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 A-1135 2 8 pin DIP socket | | Tayda | A-4755 | .

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