Originally Posted by drewdin
Thanks, I have a 110/24vdc power supply lying around and I wanted to use it to power the doorbell.
DC may work for a simple conventional doorbell but you may need to make or buy a dropping resistor to get rated life from the bell.
In addition, if the bell has moving contacts they won't last as long switching DC, but then you could put an arc-suppression network across the contacts.
And you may want to fuse the DC to limit the power/energy it can deliver.
This is getting pretty messy pretty fast.
Try to get the specs on your bell and/or post photos of the gizzards before hooking up the 24 vdc.