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This is something that has annoyed me for years now
I use small LED warning lights to indicate relays are on for things like thermos and water pumps.
typically I just run a power feed from the output side of the relay back to the light to indicate the relay is on and power is being fed to the item
only issue is when I switch it off the light slowly dims rather than switching off instantly.
how can I fix this so the light switches off instantly ?