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File:4 channel relay schematic.png - Wiki
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4 Channel Relay Board - Electronics-Lab
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5V Single Channel Relay Module Pinout, working, Interfacing, Applications
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Wiring/controlling 4 channel relay with Raspberry Pi 2b+ - Electrical
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Opto-Isolated 4 Channel Relay Board
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OS Circuit - Open Source Hardware: 4 Channel Relay Module