Optocoupler Isolation Board Voltage Converter 24V to 5V/12V to 24V/5V to 24V 4 Channel Isolated Module PLC Signal Level Board - SINONING- Electronics DIY Accessories Store
1 Channel Optocoupler Relay Module Support High and Low Trigger DC 5V/ – diymore
4 Channel 12V to 5V Optocoupler | eBay
Optocoupler with isolation 3.3V/5V/12V/24V voltage converter – Techfun.sk – At least the Arduino shop
Optocoupler Isolation Board, 12V to 5V 4 Channel Voltage Converter Isolated Module PLC Signal Level Board : Amazon.co.uk: Business, Industry & Science
12V 30A 1 Channel Relay With Optocoupler Isolation
power supply - 24V optocoupler with 12V? - Electrical Engineering Stack Exchange
Amazon.co.jp: 1 Channel 5V 12V Relay Module with Optocoupler Insulation, One-Way Relay Expansion Board Supports High and Low Level Triggering Controls and Indicators (Size : 12V) : Industrial & Scientific
1.8V 3.3V 5V 12V 24V 16 Channel Optocoupler Isolation Board Level Voltage Conversion Board PLC Signal - AliExpress
3.3V To 5V/5V To 5V/12V To 5V 4 Channel Optocoupler Isolation Board Level Voltage Conversion Board PLC Signal - AliExpress