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The Norfolk Broads Forum / Projects / R641 - Star Supreme I - Restoration
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Posted By Discussion Topic: R641 - Star Supreme I - Restoration

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Grendel
Jan-20-2011 @ 8:42 PM                           Permalink
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Electricese
you can use bolts or screws to mount those on a heatsink plate, small m3 ones would do the job. Aluminium makes a better heatsink.

Grendel

This message was edited by Grendel on Jan-20-11 @ 7:47 PM

BroadAmbition
Jan-21-2011 @ 8:25 AM                           Permalink
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Running is series would work but only if all 3 were switched on at once, which they won't be as all lights have individual switches.

When talking to the technical advisor at TT I mentioned that I had already ordered a heat sink of s/steel 200 x 130mm and he said that this is more than ample and will do just fine.

Once the resistor arrives and I collect the heat sink I'll marry them up and post a photo etc.
Thanks for your help and advice  Smile


Griff

'Broad Ambition' - 'Dreams do come true' - Afloat at last 06-10-07

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BroadAmbition
Jan-21-2011 @ 2:16 PM                           Permalink
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Oh and Littlesprite (Martin) - Very funny  LOL


Griff

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This message was edited by BroadAmbition on Jan-21-11 @ 1:16 PM

BroadAmbition
Jan-21-2011 @ 2:44 PM                           Permalink
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Just had a phone call from my mate Russ, he has collected the resistor from Farnells in Leeds, paid cash for it £2:03 inc vat BUT there was still a minimum spend of £5 plus the vat Mad  so we know have a small set of screwdriver too  Smile  which I din't really need, but hey ho and all that.


Griff

'Broad Ambition' - 'Dreams do come true' - Afloat at last 06-10-07

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rads
Jan-21-2011 @ 4:03 PM                           Permalink
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Have you only bought 1 resistor just for prototype purposes, or are you only going to use one for the final installation.

Struggling to understand how it will work if the latter.

Just curious!

David

BroadAmbition
Jan-21-2011 @ 7:34 PM                           Permalink
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Just the one as when speaking to the technical chap at TT he said just the one is sufficient to power the seven LED bunk lights on its own.

I've collected the heat sink this evening and delivered it to Bro' the resistor will also be with Bro' tomorrow and will then be mounted on the heat sink, he has three of the LED bunk lights (4 x more are ordered and expected anytime)so three will be tested together and we will see how we get on, I am confident with the knowledge and help from the man at TT.


Griff

'Broad Ambition' - 'Dreams do come true' - Afloat at last 06-10-07

Forum Manly Swot 30-07-10

www.grifftile.co.uk    DN9

rads
Jan-21-2011 @ 7:46 PM                           Permalink
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Fair enough, I'm no sparky!

Would have thought though that if the circuit is a single resistor
feeding a bank of lights, all effectively wired in parallel, then the
resistance of the bank will vary depending on the number of lamps
switched on, thus the potential will also vary, changing the
brightness of the bulbs.

Pretty sure this would happen with incandescent bulbs, LEDs run on
witchcraft so the above may not hold!

Please report findings, reading lights are on the to-do list.

David

Grendel
Jan-21-2011 @ 7:56 PM                           Permalink
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Rads I think you might just have a good point - the voltage dropped will be dependent upon the resistance of the rest of the circuit. and of course the current drawn.
Grendel

This message was edited by Grendel on Jan-21-11 @ 6:57 PM

grifftiff
Jan-21-2011 @ 9:49 PM                           Permalink
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Hi hopefully this will help . I was going to use 7 individual resistors but charlie after speaking to tech dept from tti said 1 would be ok . This said reisitor is a power resistor capable of up to 50w. As we are powering 7 LED's at next to nowt ampage about 0.8 per LED best guess the elec triangle I x V = W  in total would be 22.4 watts for all 7 give or take a few watts for internal resistance etc. All resistors have operating tolerance across there range typical 5% therefore may drop by 0.75 ohm over total range  but we are only using about half its capable operating power so should not make a great difference all being well. The output will feed 7 in parallel and retun back to in situ negative busbar. Hopefully this will work. cheers Howard Ex CPOMEA (EL) Royal navy

Submariners do it deeper

BroadAmbition
Jan-21-2011 @ 9:52 PM                           Permalink
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Did you all get that now  Question  I did ask him to put it in plain Yorkshire speak and he seems to have done so.

Hope this answers the queries, I will of course post photo's of the test and instalation etc.


Griff

'Broad Ambition' - 'Dreams do come true' - Afloat at last 06-10-07

Forum Manly Swot 30-07-10

www.grifftile.co.uk    DN9

This message was edited by BroadAmbition on Jan-21-11 @ 9:41 PM

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