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BackPush-button LCD D MEC 5G single pole normally-open tactile switch switch normally-open pushbutton push-button D Push button switch, generic, two pins | | C3, C4, C10 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54 mm, 1x10 Pin socket, 2.54 mm, 1x10 | | U2 | 1 | 10nF | Unpolarized capacitor | | | U3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14