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Amazon.com: 10Pcs 1 Channel DC 3V/3.3V Relay Power Switch Module with Optocoupler Relay Module Isolated Drive Control Board for IOT ESP8266 Microcontrollers Development Board 3v Logic Level Boards : Electronics
Amazon.com: Electronics123.com, Inc. 4 Channel Opto-Isolator on DIN-Rail Mount : Toys & Games
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