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

Avalonnw May 2, 2014, 4:09am 3

Henry_Best,
I'm using some generic 1N4000 series.
The relays have 3.3V coils 150mW each.

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