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Author l.e.ds
johns purple beast
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Registered: 7th Nov 03
Location: herts
User status: Offline
2nd Dec 03 at 18:57   View User's Profile U2U Member Reply With Quote
i brought sum leds off ebay i wire5 1 to the interier light it come on once n wont come on again does this mean it blew ??????? tried other 1 on side light done the same ???? plz help
Adam-D
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Registered: 11th May 02
Location: Cheshire
User status: Offline
2nd Dec 03 at 19:02   View User's Profile U2U Member Reply With Quote
yup i rekon its blew?
did they say thy were 12v ones ?
johns purple beast
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Registered: 7th Nov 03
Location: herts
User status: Offline
2nd Dec 03 at 19:14   View User's Profile U2U Member Reply With Quote
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=2441941373&category=15329&rd=1 thats the 1s m8
rollin
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Registered: 24th Apr 02
Location: Reading
User status: Offline
2nd Dec 03 at 19:24   View User's Profile U2U Member Reply With Quote
id imagine it would have needed a resistor? so im guessing u blew it
Houckham
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Registered: 29th May 03
Location: Newcastle upon Tyne
User status: Offline
2nd Dec 03 at 19:42   View User's Profile U2U Member Reply With Quote
Alright lads

Ok your guess was right you need a "current limiting" resistor
This is because you only want 30mA at the most going throught your led.
(some are 20-28mA)
If your using 12V and you only want 1 LED in series.

Well you all know what comes next (GCSE Physics/Technology)

V=IxR rearranged to give R=V/I

(V= voltage, I= Current, R= resistance in Ohms)

you have about a 2.5V drop over the LED

that leaves 9.5V and desired 30mA - 0.03A

so 9.5/0.03 = 316.66Ohms

then your nearest resistor value is 330Ohm Resistor
Houckham
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Registered: 29th May 03
Location: Newcastle upon Tyne
User status: Offline
2nd Dec 03 at 19:43   View User's Profile U2U Member Reply With Quote
Heres a nice link

http://www.metku.net/index.html?sect=view&n=1&path=mods/ledcalc/index_eng#single
James@CCC
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Registered: 10th Nov 03
Location: Eaton Bray, Bedfordshire
User status: Offline
2nd Dec 03 at 21:11   View User's Profile U2U Member Reply With Quote
how well did u try it the second time? cos leds only work one way, so if u switch around the wires it might light up
maybe
cobra148
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Registered: 27th Oct 01
Location: Here in front of my monitor.....
User status: Offline
3rd Dec 03 at 11:11   View User's Profile U2U Member Reply With Quote
£3.50 each plus £1.50 postage

I can do a self flashing red or blue led in a nice chrome holder for a lot less than that, guaranteed to work too.
whitter45
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Registered: 15th Nov 02
Location: Norton
User status: Offline
3rd Dec 03 at 11:21   View User's Profile U2U Member Reply With Quote
J p B i recommnd u buy them off cobra as he knows what he is on about and always has top quality goods
cobra148
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Registered: 27th Oct 01
Location: Here in front of my monitor.....
User status: Offline
3rd Dec 03 at 11:57   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by whitter45
J p B i recommnd u buy them off cobra as he knows what he is on about and always has top quality goods


I'll have to put you on the payroll I think.
OFcorsa
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Registered: 6th Jan 03
Location: Cheltenham, Gloucestershire
User status: Offline
3rd Dec 03 at 12:00   View User's Profile U2U Member Reply With Quote
Cobra apologies for not sending you anything at the mo. i have been having my car mot serviced and repaired. £430 soi am skint however i ahve 5 pound coins your address and no envelope or stampso i will sort myself out shortly.
bun
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Registered: 6th Oct 03
Location: Adel, West Yorkshire
User status: Offline
3rd Dec 03 at 12:01   View User's Profile U2U Member Reply With Quote
cobra how much for however many l.e.d's i need to do dials plus m.f.d? corsa b by the way.
whitter45
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Registered: 15th Nov 02
Location: Norton
User status: Offline
3rd Dec 03 at 12:08   View User's Profile U2U Member Reply With Quote
Just trying to help u out cobra cos i feel bad about letting u down over the steering wheel. I will send my cheque off today for the leds
cobra148
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Registered: 27th Oct 01
Location: Here in front of my monitor.....
User status: Offline
3rd Dec 03 at 12:26   View User's Profile U2U Member Reply With Quote
OFcorsa, no probs mate, may I suggest though, if your sending me five £1 coins in an envelope, it might be safer to change it for a £5 note.

Bun, for £7.75 you can have enough plug and play leds to do the dials (with rev counter) and MFD in any colour you want.

Whitter45, don't worry about it at all, its no problem whatsoever. I appreciate the advertising
OFcorsa
Member
Registered: 6th Jan 03
Location: Cheltenham, Gloucestershire
User status: Offline
3rd Dec 03 at 13:47   View User's Profile U2U Member Reply With Quote
cobra - dont worry mate i was gonna do that, cos no doubt the posties willbe like ooh money in here errr lost int he post im afraid mate.

 
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