Re: Mode Lighting Low Voltage Halogen Transfomers sold by Keene Electronics

["Jon Payne" <jgpayne@xxxxxxx>]

What's a "good old rotary dimmer"? :-)

The only dimmers I've ever known (I'm too young to have used the rheostat
stage dimmers!) are triac/thyristor based ones...

Jon
----- Original Message -----
From: "Phil Harris" <phil@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, February 25, 2003 8:31 PM
Subject: RE: [ukha_d] Mode Lighting Low Voltage Halogen Transfomers sold by
Keene Electronics



OK ... Electronic dimmable transformers...

Dimmable transformers are designed assuming that they will be controlled
by the good old "rotary" dimmers which simply reduce the voltage
going
into the dimmer and hence the output.

LD11's (and other electronic dimmers) work differently in that they
rapidly turn the output on and off for a portion of the mains waveform,
the on duration being proportional to the brightness of illumination
required.

Now, *MOST* electronic transformers seem not to mind this at all but
some will just sit there and buzz loudly (I haven't yet come across any
that do this myself). Mode and IBL transformers are specifically
designed to be "electronic dimmer friendly" and as such you can
be
certain that they will work but generally you shouldn't have a problem
with any dimmable transformers ... At least that's my experience!

Phil

> -----Original Message-----
> From: David Gumbrell [mailto:david@xxxxxxx]
> Sent: 24 February 2003 23:05
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Mode Lighting Low Voltage Halogen
> Transfomers sold by Keene Electronics
>
>
> Hi,
>
> I know this is sort of a FAQ, but then I can't find the
> answer...consistently...
>
> Keene Electronics are selling Mode Lighting "PUMA" dimmable
> transformers as "X10-compatible", but many answers on the
web
> are that electronic transformers won't work with X10 dimmers
> (specifically LD11s in my case). Has anyone tried the PUMA
> jobbies ? With success ? The LD11 instructions say it can dim
> low voltage and make no mention of transformer type.
>
> No surprises I am sure that the information I have found on
> the whole dimmable low voltage halogen situation has been
> confusing and inconsistent, eg: you can filter the noise from
> electronic transformers to you can't filter the noise from
> electronic transformer.
>
> My electrician really hates wirewound transformers ("they'll
> bring you nothing but trouble"), so I was hoping to find an
> alternative ...
>
> .. do I have to feed him more beer and sneak the wirewounds
> into his toolbox ?
>
> Cheers,
>
> David
>
>   ----- Original Message -----
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