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R3, R21, R27, R28 R4, R6, R7, R30, R31 | 1 | SW_Push | Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 Switch, triple pole double throw Precision Timers, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 A-1135 2 8 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity Micro-MaTch female-on-board top-entry thru-hole 14 pin DIP socket A-001 1 14 pin DIP socket A-004 4 Knobs Screws, nuts, and spacers (see build notes | C7.

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