If you’re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whether someone rang while you were out. Of course, ...

Here is an interesting hobby circuit of a “crank” door bell! The circuit is built around a timer 555 and a musical piezo-buzzer. The circuit works off 9 volt battery supply. One 9volt PP3/6F22 compact ...

Video doorbells have evolved to become an essential part of any smart home over the past few years. Unfortunately, so have their power requirements. Video doorbells function like mini-computers, with ...

If your home has an existing doorbell with a great viewing angle, then you should absolutely consider getting a wired video doorbell. Many homes and businesses aren't that fortunate, however, and so a ...