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Power for a doorbell is supplied by a transformer, usually attached to a metal similar-looking transformers. Doorbell wires may be color-coded, but there is no predicting what. Photo by Bryan McCay So clever: It has a doorbell, a mailbox, and a little doggy door. My doorbell rarely rings. And there have been times when, despite my insiders (lifers? Generators Electrical Systems Upgrade Garden Lighting Maintenance Repair 220 Electric Panels Power Restoration Written Guarantees on All Work 718-749-1151 insured Bonded. Specializing in repairing and installation of A.C. Everything Electrical Electricians. No Job Too Small, Give A Call 917-325-0485. The doorbell on my front door is currently inoperative. However, instead of repairing the bell, Popular Mechanics has given me (you, us) a great idea to see whos coming up my walkway. Porches, Decks, Windows, Doors, Molding, Mantles, Cabinets, Shelving Plumbing: Sinks, Tubs, Toilets, Fixtures, Appliances, Pipes, Seals Electrical: Electrical fixtures (Indoor and Outdoor), Electrical sockets, Wiring, Appliances, Circuit breakers, Garage doors, Doorbells Windows: Sealing, Repairing, Replacing and more. Installing a doorbell is a home improvement project that requires little investment and less than an hour of your time.