Drilled a 3/8th hole next to the chime hammer for the magnetic contact and double-sided taped a 3mm neodymium magnet to the side of the hammer. Works really well so far 😅
This magnetic contact plugs into my rack mounted alarm control panel. To abuse one of the inputs there.
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Magnetic contact is in the closed position until the doorbell rings which pulls the hammer down opening the contact reed switch then lets go closing the switch again.