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2That doesn't look like a relay board set up for separate power supply. Those that do will have an opto-isolator per relay.ratchet freak– ratchet freak2017-08-18 20:54:04 +00:00Commented Aug 18, 2017 at 20:54
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jVCC (where avail) is used to drive the magnetic relay coils, VCC is used to drive the logic/LEDs.dandavis– dandavis2017-08-19 12:16:16 +00:00Commented Aug 19, 2017 at 12:16
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