DH905 16V 10 Watt Doorbell Transformer for Wired Doorbells


Boost your doorbell’s ring with the DH905 transformer! This easy-to-install powerhouse amplifies your chime volume, ensuring no visitor goes unheard. Simply plug it in, connect your doorbell and chime, and enjoy crystal-clear notification. Built to last with UL/CSA approval, the DH905 works with chimes, buzzers, and more. Upgrade your doorbell experience today!

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Upgrade Your Doorbell’s Ring with the Easy-to-Install DH905 Transformer

Give your wired doorbell a volume boost with the DH905 16VAC, 10-watt transformer. This compact powerhouse transforms your home’s 120-volt hum into crystal-clear chime power, delivering a clear, unmissable announcement every time someone presses the button.

Simple Installation, Lasting Performance:

  • DIY-friendly: No electrician is needed! Connect your doorbell, push the button, and chime, and you’re ready.
  • Built to last: UL and CSA approved for both residential and commercial use, the DH905 is engineered for years of reliable service.
  • Peace of mind: Backed by a 1-year manufacturer’s warranty, you can buy confidently.

Unleash the Chime Symphony:

  • Say goodbye to faint rings: The DH905 ensures your doorbell sings loud and clear, no matter where you are in the house.
  • Multi-chime magic: Add chimes throughout your home for a full-house notification system. Never miss a visitor again!
  • Beyond doorbells: Power up buzzers, security lights, and other low-voltage devices with the versatile DH905.

Here’s How It Works:

  1. Plug the transformer into your home’s electrical outlet.
  2. Connect your doorbell push button to the transformer.
  3. Wire your doorbell chime to the transformer.
  4. Press the button, hear the chime, welcome your guest!

The DH905 is more than just a transformer; it’s a doorbell experience upgrade. Order yours today and enjoy:

  • Compact and discreet design: blends seamlessly into your home.
  • Affordable price: a small investment for big sound.
  • Easy replacement parts: always keep your chime up and running.
  • Works with all chime styles: from traditional to modern, the DH905 powers them all.

Don’t settle for muffled rings. Order your DH905 transformer now and let your doorbell sing!

  • 16VAC, 10 Watt
  • UL approved
  • Manufactured by Thomas and Betts
  • 1-year manufacturer’s warranty
  • Call for bulk discounts

The DH905 by Thomas & Betts is a 16V, 10VA wired doorbell transformer designed to work with standard wired doorbells.  The image below is a quick example of how to wire two wired doorbell push buttons and a common wired doorbell to the transformer.

wiring doorbell transformer to two buttons
wiring doorbell transformer to two buttons


No Of Doorbells To Power

Transformer Voltage


Transformer VA

Volta amps

Customer Reviews

Based on 3 reviews
M.S. (Peoria, US)
Very Good

Haven't used the transformer as yet - keeping it for future problems. Have installed the two doorbell buttons. I had hoped to swap out the inner mechanism with the old cover (which was spray painted to match house trim) but the two were not compatible. So, went with the nickel finish. Thought the new circuit board was for digital system (marked + & -) but it worked with 16 VAC just fine. In fact the LED on circuit is very bright and easy to see and should last longer than the old incandescent bulb. Had to drill out the **** holes as new screws were bigger in diameter. Am I being too picky? Anyway, I'd buy it again.

D.A. (Saint Paul, US)

16V 10 Watt Doorbell Transformer DH905

B... (Dallas, US)
Nice looking door bell

Looks nice and arrived timely. Our electrician hasn’t installed it in our new build yet, but I can’t wait to test it out.