Hi, new member here.

I may be going about this in a convoluted way, but I revel in creating and undertaking projects.

The problem: I need an audible signal for when a door is opened.

My current solution: using an old doorbell where the battery terminal on the push button unit became corroded, I used a 5 volt mains transformer and reduced the voltage to 3 volt which powers the push button unit well.
I have connected a reed switch to the push button terminals in a normally open configuration.

What happens: The chime sounds when the door is open, but continues to sound until the door is closed!

What I would like to happen: one or two chimes only regardless of how long the door is opened for.

What I think I need: a timed latching circuit.

I welcome any help in this. Thank you.