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Back\*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | | C1, C11 | 3 | 100R | Resistor | | | | J2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>