Latching Relay Setup, Diode vs Resistor

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kramttocs

Member - Posts: 24

Joined: January 20, 2020

Location: Missouri, United States

Posted: December 27, 2020 at 4:58 PM / IP Logged

I am looking to implement this: https://www.the12volt.com/relays/relaydiagram21.html

The relay on the left has a diode. Does it need to be a diode? I have some 4pins iso 280 relays that have resistors but unsure if there is a specific need in this use case for a diode.

Thank you

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