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1 Channel 5V,12V 10A Relay Control Board Module with & without Optocouplers
4 Channel Opto-Isolated Board Input 12V to 5V
3.3V To 5V/12V/24V 4 Channel Optocoupler Isolation Board Isolated Module PNP Output PLC
opto isolator - Q: 4 Channel Optocoupler to convert auto 12V signal to 5V Arduino - Electrical Engineering Stack Exchange
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