Quantity   Component name
1 × 6n137 Opto and Fiber Optic Semiconductors and ICs / Optocouplers and Optoisolators
1 × 1N4148 Discrete Semiconductors / Diodes and Rectifiers
3 × 220 Ohm resistor
1 × 470 Ohm resistor
1 × 10k Ohm resistor
1 × 3 pin slide switch
2 × 5 Din Connector
1 × 4 pole pin header
1 × PCB