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BackSwitch normally-open pushbutton push-button LCD D MEC 5G single pole normally-open tactile switch with LCD screen K switch normally-open pushbutton push-button LCD D MEC 5G single pole double throw | | | R21, R22, R23 | 3 | 1k | Resistor | | | | J8 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x2 (see [build notes](build.md)) | | | | J2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>