Re: [Phys-l] Step down transformer trouble

["Quist, Oren" <Oren.Quist@SDSTATE.EDU>]

On one occasion, in a previous house, I tried to have three different doorbell chimes in one system (upstairs, basement, backroom, etc.).  It never worked as the transformer could not put out enough power to run them all.  I did not "fry" anything, but it would not work.  Suppose the system has a "short" of some kind (recent sheet rock screws ??).  A short might damage the transformer.

Try disconnecting the bell, and then check the line continuity -- should be easy to do.



________________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu [phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of John Denker [jsd@av8n.com]
Sent: Wednesday, July 06, 2011 10:41 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Step down transformer trouble

On 07/06/2011 02:58 AM, Paul Lulai wrote:
> We can't keep our doorbell stepdown transformer working.  I thought i
> would check this group for thoughts. The transformer drops to 16v.
> That matches the input for our doorbell. The transformer is connected
> to ground and both the black and white house wires (as directed on
> installation instructions).  It is installed onto a standard junction
> box with (which has a cfl attached). I've changed transformers
> multiple times.  I checked the doorbell.  I found no problem, but
> thought a $20 change of bells might so it, so I changed it anyway
> (after the 2nd transformer).

Hmmm.

> It is installed onto a standard junction box

Heat buildup could be a problem.

Usually I've seen those things installed /not/ in a junction box.

If it needs to be in a box, make sure the box has plenty of holes.
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