Is this a wire wound toroidal transformer or what? (pic)

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Light bought from John Lewis about 2 years ago. it runs 4 x 35w 12v spotlights. In this picture I've opeded up the light and you can see the transformer (the big round thing).

light.jpg


Now I'm trying to put it on a dimmer. I've tried 2 different dimmers, one manual and one electronic/remote operable, and with each one the whole transformer/light unit (seen in the photo) buzzes, not just a bit, but so loudly it does your head in.

Help! Is this a dimmable type transformer? It has no labels but is new and from a quality place so i would hope is.

This buzzing sounds like probably a resonance, is there any way you can damp it out?


Pento
 
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Looks like one to me.

I think TLC sell a dimmer suitable for this type of transformer.
 

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