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BackDouble throw, separate symbols K switch dual-pole double-throw spdt ON-ON D Push button switch, generic, separate symbols, four pins D Push button switch OFF-(ON) | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-3545, A-3489, or A-3499\*\*\* | | | S3 | 1 | SW_Push | Push button switch OFF-(ON) | Dailywell | PAS6B2M1CESG2-5, PAS6B2M4CESG6-5, or PAS6B2M4CESG6-5 | Tayda | A-1157 or A-2425 | | Screws and spacers (see [build notes](build.md)) | | | | | J2 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/>