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BackFuse, 3 x 6mm drills Triple banana socket, footprint - 6mm drill Dual banana socket, footprint - 3 5mm LEDs - one per step // 1 rotary switch with signal lamp, generic K switch dual-pole double-throw spdt ON-ON D Screw terminal, single row, 01x03 D 2x5 pin shrouded header 2.54 mm spacing | Tayda | A-1955 | | | | | | | | J1 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x4 Pin header, 2.54 mm, 1x2 (see [build notes](build.md | | | | | | | | Tayda | A-826 | | | | R24, R26, R28 | 3 | 22k | Resistor | | S3 | 1 | TL074 | Quad operational amplifier, DIP-14"/>