In case you are interested I also took the opportunity to replace the buzzer in my safe with an LED I have mounted just above the opening handle. I fed it via a 680R resistor and it now illuminates instead of the rather loud buzzer, which is a much nicer indication the safe is in the uncontrolled state. It only required me to drill a small hole in the front door of the safe and a bit of hot glue to secure the LED. A mod you might like to mention to other builders.
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