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BackBuild notes) 1 SIP socket, 2.54 mm, 1x7 | | | | Tayda | A-1531 or A-557 | | | | R4, R6, R7, R30, R31 Switch, dual pole double throw, center OFF position K switch normally-open pushbutton push-button LED D MEC 5G single pole double throw, illuminated paddle, http://www.nkkswitches.com/pdf/gwillum.pdf switch single-pole double-throw ON-OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D 11x DIP Switch, Single Pole Single Throw (SPST) switch, small symbol D Push button switch, normally closed, generic, four pins D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14"/>