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Author Topic: LEDs on a roll/strip  (Read 863 times)

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Offline themadhippy

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Re: LEDs on a roll/strip
« Reply #15 on: July 21, 2018, 10:52:32 PM »
Quote
Bramshot how do you use them for coach lighting please ,they are D C so if the train goes back in the opposite direction surely they won’t light  L E Ds don’t run on reverse voltag
chuck a bridge rectifier in

Offline Bramshot

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Re: LEDs on a roll/strip
« Reply #16 on: July 21, 2018, 11:47:48 PM »
Bramshot how do you use them for coach lighting please ,they are D C so if the train goes back in the opposite direction surely they won’t light  L E Ds don’t run on reverse voltage .
Bob Tidbury

Themadhippy is correct, you need a rectifier for use on dc. The led will vary in intensity with speed and will go out close to and at zero speed when the voltage is insufficient to overcome the forward colt drop of the rectifier and leds themselves.

I use mine on dcc, so they are on all the time, o not illuminating in one half of the dcc cycle. I put two groups of 3, enough for one N gauge coach, back to back so that half illuminate on one half cycle, and half on the other, to spread the load between both sides of the dcc supply electronics.

Offline ntpntpntp

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Re: LEDs on a roll/strip
« Reply #17 on: July 22, 2018, 01:18:59 PM »
Quote
Bramshot how do you use them for coach lighting please ,they are D C so if the train goes back in the opposite direction surely they won’t light  L E Ds don’t run on reverse voltag
chuck a bridge rectifier in

Plus a capacitor on the output side of the rectifier if you want to avoid flicker over dirty track etc.
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!

Offline Bramshot

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Re: LEDs on a roll/strip
« Reply #18 on: July 22, 2018, 04:35:14 PM »
I did start using capacitors, but getting them to fit in an n coach is not easy, and involves hacking some of the interior about.  I have two wheels with contacts to each rail ( for Farish, 4 wheels on Dapol, ready connected), and do not have much problem with flicker. There is some, but usually sorted out by cleaning the coach wheels., as well as keeping the track reasonably clean.

Offline Caz

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Re: LEDs on a roll/strip
« Reply #19 on: July 22, 2018, 05:07:58 PM »
I use these LED strips (warm white) for all my coach lighting but find I need to add a 1k or 2k resistor in series to cut the light output down a little.  If you're fitting them to Dapol coaches that have a socket fitted for a light bar then see this old (very) tutorial for info on the connectors.  http://www.ngaugeforum.co.uk/SMFN/index.php?topic=4022.msg45608#msg45608

Offline Bramshot

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Re: LEDs on a roll/strip
« Reply #20 on: July 22, 2018, 08:07:41 PM »
Amber I run without resistor, but yes, for warm white, about 2.2k.  You can get the plugs that match the Dapol sockets from Layouts4U as well! You have to buy a plug/socket pair and throw half away.

Offline ntpntpntp

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Re: LEDs on a roll/strip
« Reply #21 on: July 23, 2018, 04:30:21 PM »
You have to buy a plug/socket pair and throw half away.

Sorry I don't understand "throw half away"  ??  Surely you mean "chuck in a bits box 'cos it might be useful for something in 20 years' time"  :D
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!

Offline mayjay

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Re: LEDs on a roll/strip
« Reply #22 on: July 24, 2018, 09:24:40 AM »
I appear to have started a technical discussion involving the use of many electronic components that I do not understand how to use or what they do. All I wanted was to light up my buildings in the simplest way with some LEDS off a roll, as seen on U tube but with no details of the precise product used. There are dozens of them out there  More confused than ever now, back to GOW, easier to understand.

 :thankyousign:

Mike (mayjay)
Mike

Offline Bealman

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Re: LEDs on a roll/strip
« Reply #23 on: July 24, 2018, 09:30:24 AM »
I assume you refer to Grain of Wheat bulbs?

I have them right through my old layout, but definitely passe.

The thing about these tiny LEDs is that they are exactly that..... tiny. This makes them ideal for N gauge purposes.  :thumbsup:
« Last Edit: July 24, 2018, 09:31:47 AM by Bealman »
Vision over visibility. Bono, U2.

Offline GrahamB

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Re: LEDs on a roll/strip
« Reply #24 on: July 24, 2018, 09:34:39 AM »
Tiny LED'S are wonderful so long as you can see to terminate the wires.

Offline Bealman

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Re: LEDs on a roll/strip
« Reply #25 on: July 24, 2018, 09:57:40 AM »
Pengi used to go into the intricacies of soldering those wires, but Lindi's post suggest there is an option these days!
Vision over visibility. Bono, U2.

Offline mayjay

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Re: LEDs on a roll/strip
« Reply #26 on: July 24, 2018, 10:26:21 AM »
I have used ready soldered nano LEDs with resistors fitted for mast lights etc. on my RC boat, now they are small, fit into a1.5mm hole. They are far too expensive for this application with the quantity that would be required, hence the interest in the LED strip. I understand that they can be cut into short lengths depending on which are used, e.g. 25mm with three LEDs. This would be ideal for small buildings (and I have a lot + "Metcalf" and similar products, and many scratch built) needing illumination, on an 8 x 4 layout. I was hoping to buy two rolls (warm white & Yellow). Have to source a suitable power supply as well12v  60w according to the many suppliers. Any supplier recommendations from those of you who have used these items?

Oh! yes Bealman, Grain of Wheat.

Access is easy, ill health prompted me to make the layout hinged.

Looked at that site 'Lindi', wont they need resistors etc. the things I don't comprehend?

Thank you all.
Mike

Offline Bramshot

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Re: LEDs on a roll/strip
« Reply #27 on: July 24, 2018, 10:32:20 AM »
3 leds in 25 mm is a lot less than the ones I use, which are moe like 50 or 60.

The 12 V 60 W supply will be for an entire roll of leds, though you could use it for less.

Without wanting to abash on about them too much, Layouts4U is one place you can get power supplies, but also on eBay etc.

I would find it easier to use pre wired individual leds so you can have one in each room, leave some rooms unlit. It might be more tricky to arrange the strips, and 3lights in one room might be a bit excessive, if that was your plan.

Offline mayjay

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Re: LEDs on a roll/strip
« Reply #28 on: July 24, 2018, 12:01:56 PM »
Thanks Bramshot.

I have looked at them, but will I need to solder resistors onto them, if so what resistance will be needed? I can see your point about looking better with some areas not illuminated. If I decide to go that way a costing would be required opposed to the strips. I have just had a count up of buildings and the minimum number of lights needed to date will be 80 ish.

There are times when I wished I lived in or near a town with a club, its a bit lonely out in the sticks. I think that I would have given up if it were not for the input from the forum. A BIG thanks to you all.
Mike

Offline ntpntpntp

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Re: LEDs on a roll/strip
« Reply #29 on: July 24, 2018, 12:07:37 PM »
...I need to solder resistors onto them, if so what resistance will be needed?
Depends on what supply voltage you use, but typically a minimum of a 1k resistor for a 12V - 16V supply.  Higher value resistance if you want the lights a little less bright. sometimes you need to experiment.
Nick.   2016 celebrating the 20th anniversary of "Königshafen" exhibition layout!

 

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