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RE: Halogen lights / Transformers (robots in disguise)
- To: <ukha_d@xxxxxxx>
- Subject: RE: Halogen lights / Transformers (robots in
disguise)
- From: "Dr John Tankard" <jtankard@xxxxxxx>
- Date: Fri, 30 Jun 2000 11:30:01 +0100
- Delivered-to: rich@xxxxxxx
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
> 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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