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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Dimmers For Low Voltahe Halogens
Hi,
Was wondering if its possible to fit a dimmer to low voltage lights with a transformer. Was looking for a remote control one, but keep reading that its not possible to use one but have read a few post about them being used what's the correct procedure. Cheers Oli |
#2
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Dimmers For Low Voltahe Halogens
The Question Asker wrote:
Hi, Was wondering if its possible to fit a dimmer to low voltage lights with a transformer. Was looking for a remote control one, but keep reading that its not possible to use one but have read a few post about them being used what's the correct procedure. Cheers Oli AFAIK, Halogens with an electronic transformer (much lighter than iron cored one) can be used with a dimmer designed for use with such things. Those with ordinary iron cored heavy transformers cannot be used with dimmers due to their inductance upseting the triac control and possibly overheating the transformer arising from a DC component fed to the transformer. Bob |
#3
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Dimmers For Low Voltahe Halogens
"Bob Minchin" wrote in message ... The Question Asker wrote: Hi, Was wondering if its possible to fit a dimmer to low voltage lights with a transformer. Was looking for a remote control one, but keep reading that its not possible to use one but have read a few post about them being used what's the correct procedure. Cheers Oli AFAIK, Halogens with an electronic transformer (much lighter than iron cored one) can be used with a dimmer designed for use with such things. Those with ordinary iron cored heavy transformers cannot be used with dimmers due to their inductance upseting the triac control and possibly overheating the transformer arising from a DC component fed to the transformer. Bob My experience with these was that, although they dim ok, the use of a dimmer makes the transformer buzz unacceptably - even when the dimmer control is set to full power. It may depend on how much you pay - and these were relatively cheap ones from Screwfix - but they were claimed to be dimmable and compatible with the dimmers used. In the end, I did away with the dimmers and resorted to switching the lamps in banks. [I have 12 lamps in 3 groups of 4, with each each group having its own switch and transformer]. Roger |
#4
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Dimmers For Low Voltahe Halogens
"Bob Minchin" wrote in message ... The Question Asker wrote: Hi, Was wondering if its possible to fit a dimmer to low voltage lights with a transformer. AFAIK, Halogens with an electronic transformer (much lighter than iron cored one) can be used with a dimmer designed for use with such things. Those with ordinary iron cored heavy transformers cannot be used with dimmers due to their inductance upseting the triac control and possibly overheating the transformer arising from a DC component fed to the transformer. My experience has been the reverse of Bobs - I have been using low voltage Halogen lamps via standard transformers and a dimmer for the last ten years without any problems. I started with electronic transformers but they did not like dimming lights less than 50% before they cut out. They also didn't last long and I replaced them with standard transformers. Because the switch on current is higher with inductive loads, I took the precaution of halving the power rating of the dimmer. Read the manufactures spec carefully before you buy. Robin |
#5
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Dimmers For Low Voltahe Halogens
So OK, how am I meant to know if I have a electronic transformer, or an iron
corded one. The light set came with 3 halogens with a transformer, will it say on the transformer if it is electronic or not, and where do u recommend I buy a inductance dimmer? Thanks Oli |
#6
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Dimmers For Low Voltahe Halogens
An electronic transformer weighs a few ounces and is generally an
oblong shape, about 4cm by 4cm by 15cm. http://www.screwfix.com/app/sfd/cat/...10483&ts=61011 An iron cored one will weigh a few pounds and be a lot larger, e.g 150W toroidal approx 18cm diameter and 10cm high or laminated iron 10cm by 10cm by 15cm. This is a 50VA toroidal weight 750g (approx 2lb) http://www.maplin.co.uk/Products/Mod...05&modulelist= And a list of bare transformers: http://www.maplin.co.uk/Products/Mod...77&modulelist= Hope this helps. On Thu, 4 Sep 2003 08:18:20 +0100, "The Question Asker" wrote: So OK, how am I meant to know if I have a electronic transformer, or an iron corded one. The light set came with 3 halogens with a transformer, will it say on the transformer if it is electronic or not, and where do u recommend I buy a inductance dimmer? Thanks Oli Lawrence usenet at lklyne dt co dt uk |
#7
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Dimmers For Low Voltahe Halogens
In article ,
The Question Asker wrote: So OK, how am I meant to know if I have a electronic transformer, or an iron corded one. The light set came with 3 halogens with a transformer, will it say on the transformer if it is electronic or not, and where do u recommend I buy a inductance dimmer? A dimmer suitable for a transformer will work ok with a resistive load - although it's more expensive. Any electrical wholesaler should have them - as do some of the sheds. The lighting set should say what dimmer is needed and whether it is suitable for dimming. LV transformers are usually round and heavy. Electronic, or SMPS types, are usually rectangular and light. -- *The sooner you fall behind, the more time you'll have to catch up * Dave Plowman London SW 12 RIP Acorn |
#8
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Dimmers For Low Voltahe Halogens
The Question Asker wrote:
Hi, Was wondering if its possible to fit a dimmer to low voltage lights with a transformer. Was looking for a remote control one, but keep reading that its not possible to use one but have read a few post about them being used what's the correct procedure. Cheers Oli Yews its possible, and I have done it. I used stansdard dimmers and electrionic transformers that were sold as 'dimmer capable' and indeed they are. I believe its also possible to get dinmers that will handle the load f a toroidla transformer as well. But no one seemd to give me a definite YES when I asked, so I didn't use toroids - which I prefer cos they buzz less, and are probably more simple and roubust creatures. |
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