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Hi guys thanks for the input.
ijcox thanks for your input.But it uses another chip.Anyway I'll work on that circuit in my another application.
@ Dave
That's the one I was looking.Note that the user won't press & hold the switch.He/she just press the switch quickly & release it.At that time the relay must be ON for at least 4-5 seconds. During this time power to the EML will be released. So the door will be released.