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-   -   Use a 20VAC trans for a 16VAC doorbell? (http://www.diychatroom.com/f18/use-20vac-trans-16vac-doorbell-155690/)

j_sun 09-03-2012 01:20 PM

Use a 20VAC trans for a 16VAC doorbell?
 
Hi,
I picked up a new doorbell and it says it requires a 16VAC txfmr. The doorbell I am replacing uses a 20VAC one. Is there typically a tolerance on these doorbells or do I need to get the exact voltage they are saying? (Which, not surprisingly, seems to be only made by the same company)

Thanks,
Jason

stickboy1375 09-03-2012 01:45 PM

12 Attachment(s)
Quote:

Originally Posted by j_sun (Post 1002326)
Hi,
I picked up a new doorbell and it says it requires a 16VAC txfmr. The doorbell I am replacing uses a 20VAC one. Is there typically a tolerance on these doorbells or do I need to get the exact voltage they are saying? (Which, not surprisingly, seems to be only made by the same company)

Thanks,
Jason

If the manufacture says 16 VAC, then I would stick to that voltage. They probably know what they are talking about. :)

ddawg16 09-03-2012 02:00 PM

I agree with stickboy......

If it was 18Vac and you had a pretty good distance to go....ok....but at 20Vac.....unless you have small gauge wire..good chance the new door bell will not last long.

kbsparky 09-03-2012 02:06 PM

Are you sure your old transformer is 20 VOLTS and not 20 VA (watts)?

stickboy1375 09-03-2012 02:11 PM

12 Attachment(s)
http://images10.newegg.com/NeweggIma...007-005-01.jpg


Typical multitap transformer..

dmxtothemax 09-03-2012 06:49 PM

You can use a resistor to drop that extra 4 volts !
But we need to know how much current the doorbell uses ?
Do you know ?

Auger01 09-03-2012 11:28 PM

CLose enough for me. I bet you a doughnut that the "20 volt" transformer is at least 2 volts either way off of 20 volts.


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