I want 2 chimes for one doorbell, one upstairs, one downstairs. Everybody recommends getting a higher volt-amp transformer to power both, but they're hard to find and expensive. Whereas, the low-va transformers are dirt cheap and in fact come with some doorbell/chime kits for only about $2 more. Can I just mount a second low-va transformer next to the old one and run the same button wires to both? Do I have to match the va of the transformers? Or would I need a second, totally independent circuit from the button?
Thanks, jlfork

Trying to combine two transformers has all kinds of problems. Ranging from proper load sharing to phasing problems.

Now you can get 20 VA transformers at a reasonale cost.

http://electrical.hardwarestore.com/15-57-doorbell-buttons-accessories/8-16-24v-20-watt-transformer-621043.aspx

http://www.eztone.pro/ezs-wire-transformers.htm

That said, I have not check out the specs on the chimes. But if they are the simple Ding-dong type and you don't have kids that lean on the button for several minutes at a time I suspect that you can run two off of one transformer.

If it fails then replace it with the larger one.

Well, darn... Okay, I'll try the single, original transformer approach and see what happens. It's certainly easier, if it works. Thanks for the advice and online sources for higher-va units, should I need one.
jlfork