It’s not that I like to waste my time putting life’s little problems ahead of the big ones, but when I installed a second doorbell chime upstairs a few months ago, I discovered that a standard 10 VA doorbell transformer does not have enough juice to ring two doorbells at once.1 A perfect excuse for a Digi-Key order.
A modern Level V wall wart is perfectly safe, draws less than 0.3 W of standby power, and costs about the same as an iron transformer. Why are these not standard equipment for doorbells today?
I also tore out two generations of unreliable wireless stick-on doorbell systems. It appears that they were installed when the hard-wired doorbell stopped working due to corroded switch contacts. More than a century of research into making reliable switch contacts has also been ignored by the doorbell industry. ↩︎