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BackV3.2 3afa35e4b1 PCB initial layout, no traces One SPST switch per step, to indicate current step. (10 One multi-pole rotary switch with signal lamp, generic K switch single-pole double-throw spdt ON-ON D Double Pole Single Throw (SPST) switch with LCD screen E3 SAxxxx switch normally-open pushbutton push-button LED D MEC 5G single pole normally-open tactile switch SPST right angle, http://spec_sheets.e-switch.com/specs/P040170.pdf Switch, single pole double throw Precision Timers, 555 compatible, PDIP-8 | | Tayda | A-4755 | | | | S1 | 1 nF | Unpolarized capacitor | | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92