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Author Topic: leds  (Read 1383 times)

nige2307

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leds
« on: February 22, 2011, 10:58:19 PM »

simple question and one i think i know the answer to.. but not 100%.
purchased lighting kit from mmm, lost diagram or wiring! 7 lights, 6 leds ,3 resistors.
the part i cant recall is.. how many leds can be used per resistor at 6v and 12v?
also are resistors directional or can i wire either way ?
Appreciate any help


cheers
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Tug-Kenny

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Re: leds
« Reply #1 on: February 23, 2011, 11:04:24 AM »


Hi Nige

With LED's it's advisable to have a resistor for each one.  These are tailored for the supply voltage.  The resistors are NOT directional so no problems there.  However,  the LEDS are directional so connect the + ve  to the long wire (via the resistor of course) and the -ve to the short wire

I would suggest you connect a resistor to a LED and supply it with 6 volts to start. Judge the brightness and decide if you want to go up to 12 volts.  If it is too bright then you will need a higher value resistor to Dull it down or else it will burn out.

Hope this helps

Ken


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Netleyned

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Re: leds
« Reply #2 on: February 23, 2011, 11:23:54 AM »

Why not ring or email Brian at MMM he will tell you exactly what you need to know.

Ned
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Rex Hunt

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Re: leds
« Reply #3 on: February 23, 2011, 11:42:45 AM »

http://led.linear1.org/led.wiz


depends on led used
enquire within!


Rex
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malcolmfrary

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Re: leds
« Reply #4 on: February 23, 2011, 12:22:23 PM »

The parts supplied suggest 3 arrays of 2 LEDs.  In a series array, all (both?) LEDs will carry the same current.
Without knowing the exact parameters of the LEDs supplied, it is difficult to know what numbers to put into the calculator in Rex's link above, but at a guess, if the LEDs drop 2.1 or 2 volts each, and need to run at about 20mA, then on 12 volts the resistor will be about 390 ohms (orange, white, brown) or 470 ohms (yellow, viollet, brown).  If a 6 volt supply, 100 ohms (brown, black, brown).
The link also suggests the appropriate circuit and gives as an option, the resistor colour codes.
Resistors dont care which way round they are connected.  The D in LED stands for "diode", and, since they have very limited reverse voltage tolerance, they must never be connected the wrong way round, as they will protest by dying.
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Netleyned

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Re: leds
« Reply #5 on: February 23, 2011, 01:07:10 PM »

Looking at MMM's list of light kits you should have 7 Brass lamps,4 white, 1red, 1green, 1 yellow +a non working anchor light.
This seems to be the normal set up for the majority of tugs.
As I said before Brian will probably email you a replacement diagram if you give him a call. He is very helpful.

Ned
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unicorn

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Re: leds
« Reply #6 on: February 23, 2011, 05:55:04 PM »

 :-) :-) :-) :-) :-)

   Quote from MMM`s LED wiring diagram  "An LED requires approx 2.8 volts and the resistor enclosed
  is suitable for driving 2 LEDs on 6v or 3 on 12v "  having said that, in some cases I`ve used 1 resistor
  per LED  --  hope this helps.
                                         unicorn
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nige2307

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Re: leds
« Reply #7 on: February 26, 2011, 10:17:01 PM »

Appreciate all the info .
everything seems so obvious once explained!

ned... Obvious answer... which i obviously overlooked ! and yes its that light kit.
unicorn...i love the simple answers... thank you.


thank you all for your input its appreciated


Nige :-)
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nige2307

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Re: leds
« Reply #8 on: February 26, 2011, 10:20:03 PM »

tug kenny
 like the "cost of living" quote......


cant beat humor.
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