Re: Halogen lights / Transformers (robots in disguise)

["Campbell" <c.macd@xxxxxxx>]

It did say suitable for most dim switches or something like that, but
presently seems to be resolved, till I decide to fit a diferent transformer
(at the very bottom ofthe to do list.).

Campbell
----- Original Message -----
From: "Dr John Tankard" <jtankard@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, June 30, 2000 11:30 AM
Subject: RE: [ukha_d] Halogen lights / Transformers (robots in disguise)


>
> > I have some what I consider expensive halogen lights, with donut
> > transformer
> > and have found when dimming it can be noisy, even more so when
using x10
> > dimmer switch or lamp module. I presume the x10 module is
actually
> > interfering more with the "full brightness" signal than
the normal
rotary
> > dimmer. In the end I used an appliance module and just a normal
switch.
> >
>
> The normal torroidal transformers should not be used for dimming with
> standard dimmers. The reason is that most dimmers chop up the normal
> waveform using a triac or diac and they do not provide symmetrical
outputs
> on the +ve and -ve half cycles, this saturates the transformer core.
This
> could result in either the destruction of the transformer or a fuse.
>
> You need to check with the manufacturer to see if the output is
symmetrical,
> most using microcrontrolers _should_ be ok, if the code is correct.
>
> John
>
>
>
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> Just when you thought it was over...
> http://click.egroups.com/1/6013/9/_/2065/_/962409737/
>
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>
>


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