8mm Forum: 150 watt transformer ?

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Posted by Mark Todd (Member # 96) on March 02, 2014, 12:13 PM:

Hi I wondered if there is a transformer you can buy would run the 15 volt 150 watt lamp without blowing etc.

Best Mark.

ps or anyone got a UK one with a plug in one end and two wire out of the other to sell please. Thanks.

[ March 02, 2014, 01:55 PM: Message edited by: Mark Todd ]

Posted by Paul Mason (Member # 4015) on March 04, 2014, 09:47 AM:

Here's one on Ebay. You need to wire it up and put it in a suitable box which is not as easy as it sounds to make a good job of it.

Transformer 160VA 2X 15V Price for 1 Each - VTX-146-160-115

Posted by Mark Todd (Member # 96) on March 04, 2014, 09:56 AM:

Do you have a link please paul.

Thannks Mark.

Posted by Paul Mason (Member # 4015) on March 04, 2014, 10:00 AM:

Sorry Mark,
When I put the link in it wouldn't work and I tried again several times. Can't think what the problem is. If you go on Ebay put the title in the search box Transformer 160VA 2X 15V Price for 1 Each - VTX-146-160-115. Best Wishes.

Posted by Steve Klare (Member # 12) on March 04, 2014, 11:41 AM:

Here's the same part at a UK based electronics distrubutor:

Transformer

What's important to know here is that when there are two secondary windings you really should connect them in parallel to operate at full power. The wire inside may or may not be capable of carrying the current at full power, and you wil not find out for sure until you melt something. Regardless, the thing will last longer if you use both anyway because it will run cooler.

(Also they have to be phased corectly when you connect them, or you will have a short circuit.)

Posted by Martin Jones (Member # 1163) on March 04, 2014, 12:54 PM:

In other words... for 150W 15 volt lamp supply...

"Live" is RED & YELLOW joined together
"Neutral" is ORANGE & BLACK joined together

Mains input @ 230/250 volt to BLUE & BROWN

Excellent choice... toroidal wound giving very small external field and therefore less likely to cause "hum" in nearby audio circuits. Solid core, no mechanical noise. These Run cooler than conventional transformers. Very good price.

Posted by Maurice Leakey (Member # 916) on March 04, 2014, 01:08 PM:

Here's the eBay link:-
http://www.ebay.co.uk/itm/Transformer-160VA-2X-15V-Price-for-1-Each-VTX-146-160-115-/390769252521?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item5afba998a9

Posted by Maurice Leakey (Member # 916) on March 04, 2014, 01:09 PM:

Here's a box from Maplin which might do as a container.
http://www.maplin.co.uk/p/hammond-project-box-light-grey-125x100x60mm-n25hg

[ March 05, 2014, 02:30 AM: Message edited by: Maurice Leakey ]

Posted by Mark Todd (Member # 96) on March 05, 2014, 07:04 AM:

Thanks all and as I`m a bit thick on this side of things, is this rated OK for just the one bulb A1/232.

Could someone please tell me what how etc in pretty clear detail.

Appreciate all of the links etc too.

Thanks Mark.

http://www.maplin.co.uk/p/15v-250ma-miniature-transformer-yn17t any good possibly !!!

Posted by Martin Jones (Member # 1163) on March 05, 2014, 08:00 AM:

Mark,
A 150W lamp requires 10 amperes at 15 volts to operate properly... that's 15 (V) x 10 (A) = 150 (W). the suggested transformer in the links will supply 160 watts more than you require) if connected the way I specified.

The Maplin transformer is 15 volts at 1/4 Amperes (250mA). It can only run a 3.75 watt lamp.

The one in the links is what you need...period!

Posted by Mark Todd (Member # 96) on March 05, 2014, 09:22 AM:

Thanks Martin so will the bulb be OK ? at that. Knock a few hours off etc ? possibly.

I think I heard the long life lamps are a bit higher so run lower at 150 longer ? But prefer xenophot anyway.

I`m a bit lost on this side of things.

Also I may be a bit dim here but not sure about the 2 x 15 volt price for 1 each bit on the ebay add !!!

Thanks Mark.

PS emailing you too.

Posted by Martin Jones (Member # 1163) on March 05, 2014, 10:02 AM:

It's only ONE transformer, which has TWO 15 volt windings, each capable of 80 watts. You have to connect the two 15 volt windings together to provide enough power to drive your 150 watt lamp, and you will have a margin of safety of 10 watts, which is OK and will not harm your lamp.
You join the windings together exactly as I have explained earlier in the thread (use electrical connector blocks).

I explain it again here:
There are 6 colour coded wires....
1. Connect the mains Input to the BLUE and BROWN wires.If you use a switch, it goes in the BROWN wire which connects to the LIVE side of the mains.BLUE connects to the NEUTRAL side of the mains.
2 Connect RED & YELLOW together and connect them to one side of the lamp.
3. Connect ORANGE & BLACK together and connect them to the other side of the lamp

Posted by Mark Todd (Member # 96) on March 05, 2014, 10:11 AM:

Thanks Martin, most kind.

Best Mark.

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