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4 Channel / 8 Channel Relay Board Type-B USB Programmable ULN2803 Relay Driver Chip For Arduino 4 Way / 8 Way Relays 5V 12V - AliExpress
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Teyleten Robot DC 1 Channel Optocoupler 3V/3.3V Relay High Level Driver Module Isolated Drive Control Board 3V/3.3V Relay Module for Arduino (Pack of 5): Amazon.com: Industrial & Scientific
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