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BackDual-pole double-throw DPDT 3pdt ON-ON D Double Pole Single Throw (SPST) switch, small symbol D Switch, single pole double throw K switch normally-open pushbutton push-button Side push button (https://www.alps.com/prod/info/E/PDF/Tact/SurfaceMount/SKRT/SKRT.pdf push horizontal SPST 1P1T straight NO SMTR C&K E-Switch sub miniature slide switch, JS series, DPDT, right angle, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf tactile switch http://www.ckswitches.com/media/1479/kmr2.pdf CK components KSC6 tactile switch D Switch, three position, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | | J2 | 1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92