Component pin-outs

6N138 Optocoupler

• Pin 1 -- NC
• Pin 2 -- LED Anode (input +)
• Pin 3 -- LED Cathode (input -)
• Pin 4 -- NC
• Pin 5 -- GND
• Pin 6 -- V (output)
• Pin 7 -- V (base)
• Pin 8 -- VCC (+5V)

74HC14 Schmitt‑Trigger Inverter (DIP‑14, notch up)

• Pin 1 – Inverter 1 Input  
• Pin 2 – Inverter 1 Output  
• Pin 3 – Inverter 2 Input  
• Pin 4 – Inverter 2 Output  
• Pin 5 – Inverter 3 Input  
• Pin 6 – Inverter 3 Output  
• Pin 7 – GND  
• Pin 8 – Inverter 4 Input  
• Pin 9 – Inverter 4 Output  
• Pin 10 – Inverter 5 Input  
• Pin 11 – Inverter 5 Output  
• Pin 12 – Inverter 6 Input  
• Pin 13 – Inverter 6 Output  
• Pin 14 – VCC (+5 V)
   

MIDI 5-pin DIN

• Pin 4 – Signal source
• Pin 5 – Signal return
• Pin 2 – Ground