Amazon.com: HiLetgo 12V 4 Channel Relay Module with OPTO-Isolated Support High and Low Level Trigger : Industrial & Scientific
5V Four-Channel Relay Module - Pin Diagram, Specifications, Applications, Working
5V Four-Channel Relay Module - Pin Diagram, Specifications, Applications, Working
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Amazon.com: JBtek 4 Channel DC 5V Relay Module for Arduino Raspberry Pi DSP AVR PIC ARM : Electronics
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4-Channel Relay module - Geeetech Wiki
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Grove - 4-Channel Solid State Relay | Seeed Studio Wiki
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Universal SPST 80 Amp 4 Pin Relay 12V Hi-Amp
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Amazon.com: SainSmart 4-Channel Relay Module : Automotive
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Relay Module 5V x 4 Relay w/ Opto-isolation - ProtoSupplies
