My house is a 117 year old masterpiece of evolving building codes and improvisation. One of the things I expect to do at some point in the future is get a doorbell camera, though it's not on the immediate horizon. When we moved in, the doorbell was a wireless, battery powered sort that I find to be moderately annoying. Considering those two things, I bought a Honeywell AT140A1000, as it had good reviews regarding smart doorbells specifically.
Anyway, I finally got around to installing it yesterday, and here's how I had it set up.
Aside from the transformer being 24VAC and the chime calling for 16, I don't think I broke any rules. Indeed, it worked for an hour or two. Eventually, though, I heard a pop over by the panel, where I have the transformer mounted. It wasn't loud, so I figured I had blown a fuse, even though at that moment I wasn't even touching any wires/connections/outlets/switches. I went to investigate, and all fuses were in order. But it stunk a little. Later reading indicated that transformers can stink a little when you first power them up.
Sometime after, I went to check the doorbell again and saw it no longer cause the chime to fire. So I tested everything, and sure enough, the transformer's secondary was at 0 volts. Not even the 0.065 volts I get from other "broken" circuits in the house, but flat zero. the transformer was also extremely hot. Like, I wouldn't want to handle it for more than a couple of seconds kind of hot.
I still had the original transformer (I wonder how old it is) so I hooked it up again as the sacrificial lamb juuuust in case. This one also got extremely hot, but appeared to not even last long enough for me to get up from the basement to press the doorbell.
So before I grab another Honeywell... help? I am an absolute novice when it comes to higher voltage AC (12v DC is my playground, usually) but this ought to be so simple even I can figure it out. And yet... =)
Thanks in advance for your help!
EDIT: Well, I just learned that you need a certain (larger) amount of resistance on the primary side of this kind of step-down, and a different (smaller) amount of resistance on the secondary side. That, and if there's a lack of continuity on either side, the thing is toast. Or, if there is continuity between the two, it is also dead. Turns out that both transformers I blew up yesterday have no continuity on the primary side, but both are still beeping on the secondary side. So... I wonder if that points even harder toward the breaker box feeding too much power into the transformer. I get a 126V read from the leads coming out of the breaker box. Is that enough to explode everything? I dunno.