Hi, I'm trying to switch 4 relays simultaneously with arduino. Essentially, I have these relays' coils connected in parallel. I tried connecting them with every relay having its own rectifying diode and it works just fine. The question is, is it necessary to have a diode on each of the relays, or c…

Multiple relays in parallel with rectifying diodes

Grumpy_Mike May 2, 2014, 4:10am 4

Yes one diode across them all will do.
That diode is good for an amp so it will be fine.

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