Resistor info needed

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Krisis
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Resistor info needed

Post by Krisis »

I need to put a resistor in line as its a bit bright!
Which one should I use?
Again please help me
Kris
ps one krisis to another seems to be the way at the moment



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VWCamperfan
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Post by VWCamperfan »

Try a 1000 ohm resistor to run a normal led from a 12 volt supply. If its still too bright then try a 2000 ohm resistor, should bring it down ok but get a 1 amp resistor as you are running a few LED's there!
Mark.

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Krisis
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Post by Krisis »

Thank you :D
On MNaplins site looking now :D
Cheers Kris
Its not broke? fiddle with it until it is, then you can fix it
Oh and the name is pronounced CRISIS
CS/JK/CS 1.6 diesel on a DY/DY/DU 4 speed box (3rd engine & gearbox now fitted)
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Krisis
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Post by Krisis »

HOW MANY PAGES!?!?!?! :?
and a search engine jobby thats :?
I will try again tonight when I have a wee dram to focus the mind
Kris
Its not broke? fiddle with it until it is, then you can fix it
Oh and the name is pronounced CRISIS
CS/JK/CS 1.6 diesel on a DY/DY/DU 4 speed box (3rd engine & gearbox now fitted)
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tonytech
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Post by tonytech »

VWCamperfan wrote: get a 1 amp resistor as you are running a few LED's there!
:shock:
Resistors dont have current ratings, they have wattage
a 1000 ohm resistor with 1A running through it will dissapate 1000W, ie a small electric fire.
Mind you, it would need to be connected to 1000V to do so.

Does the tacho have a separate wire that lights it up?
Idealy stick a current meter in this and find out how much current the leds are taking?

Otherwise start with a 100 ohm 1Watt resistor and add another 100 ohms ( in series if it is still too bright) (in parallell if it is too dim)

T
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improving light spread from LED lights

Post by VWlewis »

I came across this guy who has tested the ideas to disperse LED light - filing off the top was not as good as frosting them!! :shock:

read all about it here: http://gotwind.org/led_experiments.htm

Worth a try I think!
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Krisis
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Post by Krisis »

Hi Guys,
There is a single wire that feeds the lights on the pod.
Me being stupid I want to keep it simple, as me :lol: you know put something in line job done :lol:
So which resistor do I need and how do I fit it ?
Series is in line ? Parallel is bridged ?
Kris
Its not broke? fiddle with it until it is, then you can fix it
Oh and the name is pronounced CRISIS
CS/JK/CS 1.6 diesel on a DY/DY/DU 4 speed box (3rd engine & gearbox now fitted)
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tonytech
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Post by tonytech »

OK it really is guesswork with out knowing how much current the LEDs are drawing.
Maplin do some high power resistors.
http://www.maplin.co.uk/Search.aspx?men ... 0Wirewound

I'd experiment with the 100 ohm 7 Watt ones.
A single resistor in the feed will probably do the job, if it is too dim you could try a 47 ohm one instead.

T
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Krisis
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Post by Krisis »

28 LEDs is that any use?
Would it be an idea to fit a variable? & again if so which one?
I'm going back to Maplins 8)
Kris
Its not broke? fiddle with it until it is, then you can fix it
Oh and the name is pronounced CRISIS
CS/JK/CS 1.6 diesel on a DY/DY/DU 4 speed box (3rd engine & gearbox now fitted)
07704 771 285
aka Mr Cortisone
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AngeloEvs
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Post by AngeloEvs »

If you can hang on till Tuesday I will check my stock, I should have several high power (5/10W) wire wound potentiometers that will solve your problem. You will be able to adjust the brightness as desired. Maplin do not do them anymore. If I have a suitable one you can have it for free!
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