Source google image: https://ae01.alicdn.com/kf/HTB1iN0xIXXXXXcKXFXXq6xXFXXX6/10pcs-PC817-EL817-8-channel-opto-isolator-module-optical-coupling-isolation-module-3-5-12-24V.jpg_640x640.jpg
Channel 5 isolation
Source google image: https://ae01.alicdn.com/kf/HTB1iN0xIXXXXXcKXFXXq6xXFXXX6/10pcs-PC817-EL817-8-channel-opto-isolator-module-optical-coupling-isolation-module-3-5-12-24V.jpg_640x640.jpg