Thanks guys. I suspect this is the problem. I did discover shortly
after posting this that I was mistaken about the transformers being DC;
both the original one and the doorbell ones are AC. Fortunately, I
decided to save the original one until I had permanently fixed the light.
The
original transformer output is 24VAC-50VA, while the doorbell one is
24VAC-20VA. Not four times as John suspected, but I am sure that 2.5 times is
way too much. Plus, as everyone guesses, the doorbell ones are almost
definitely not designed for a continuous load. Now, I just have to find the
right transformer. I don't think any of the big box stores carry them; I'll
do a little surfing and see what I can come up with.
Thanks again.
> From: rlwhitetr3b@hotmail.com
> To: shop-talk@autox.team.net
> Date: Sat, 1 Mar 2008 14:09:42 -0600
> Subject: Re: [Shop-talk] Mystery of the blown transformers
>
> Jim,
>
> I think your problem is that the replacement transformer is not up to the
> job.
> As others has said you could calculate the cold resistance, but maybe it
would
> be better to measure the current before dies.
>
> When picking out a replacement, you have to look at the continuous load
> rating. A door bell would be a very short duration load and I would not
> expect the transformer to handle its rated output continuously.Rich White
St.
> Joseph, IL USA
> '63 TR3B TCF587L
> That ain't a scrap pile, that is my car!
> See it moves!
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