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Do I Need a Transformer for my Doorbell?

Do I Need a Transformer for my Doorbell?

April 07, 2019

We get a lot of questions about doorbell transformers! Here we will attempt to answer the most common of them. Please see our handy wiring guide for more details on a range of installation configurations!

What is a doorbell transformer?

A transformer converts line-voltage to low-voltage (16 volts). In the United States, line-voltage 120 for most household wiring (this is what is running to your lights and outlets). In Europe and other parts of the world, line-voltage is 240. Any transformer that converts line-voltage to low-voltage will work as a doorbell transformer.

Doorbell transformer wiring diagram

Is a transformer required for all doorbells?

Yes. Doorbells are low-voltage applications and they will not work without a transformer.

Do I need a transformer?

Are you replacing an existing doorbell? If so, then you probably already have a transformer buried in a wall somewhere. Replacing your existing doorbell or chime should be straightforward and whatever wires you find when you remove the old doorbell will work with the new Spore doorbell button or chime. 

If you are building new construction or doing a remodel and adding a doorbell for the first time, you WILL need a transformer. 

Can I buy my doorbell transformer from Spore? 

Yes! We sell a transformer for 120-to-16 applications here.

How many transformers will I need?

Only one transformer is required for your doorbell system (doorbell button and chime). It can even support multiple doorbell buttons and chimes. 

What about video doorbell systems?

Video doorbell systems are low-voltage and require a transformer. If you have a video doorbell button that you are using with a Spore RING chime, you will be wiring both to the same transformer.


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