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BackLCD screen K switch spdt single-pole double-throw spdt ON-ON illuminated red green D Push button switch, normally open, two pins, 45° tilted D Momentary Switch, dual pole double throw D Switch, three position, dual pole double throw | | | U3 | 1 nF | Unpolarized capacitor | | J3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>