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BackManufacturer | Part | Vendor | SKU | | J4 | 1 | B20k | Potentiometer | | 1 | LED | Light emitting diode Push button switch | | J12 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 KK254 Molex header 2.54 mm spacing"/>