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3V-5V 12V 24V 1 Ch 80KHz Optocoupler Insulation Module Board No Din Rail PLC | eBay
Single Channel 12V Optocoupler Breakout Board — PMD Way
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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