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LED light question

Old 07-27-2011, 07:00 PM
  #1  
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Default LED light question

hey guys. well i am thinking of getting a micro rally at some point and am thinking about putting led lights in it. i was wondering if anyone knows how i would use these? and if a battery is needed, will a 3.7v 1 cell lipo work to power these lights?

http://www.hobbypartz.com/79p-10191.html
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Old 07-27-2011, 07:09 PM
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Default RE: LED light question

ORIGINAL: electricrc68

hey guys. well i am thinking of getting a micro rally at some point and am thinking about putting led lights in it. i was wondering if anyone knows how i would use these? and if a battery is needed, will a 3.7v 1 cell lipo work to power these lights?

http://www.hobbypartz.com/79p-10191.html

Working voltage: DC12V
It was actually bolded in the product description
So no you would need a 3S lipo fully charged

If anything you would have to get some cheap white(or whatever color you want) LED's off ebay, and if running them off a 1S hook em up in parallel with a 1k or so resister in series with each LED to the battery
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Old 07-28-2011, 05:52 AM
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Default RE: LED light question

okay thanks.
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Old 07-29-2011, 04:01 PM
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Default RE: LED light question

okay well i got these two white LED lights from a flashlight. how would i wire these in parallel? i want to de solder them from the circuit board...will it still work fine when wired?
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Old 07-29-2011, 05:10 PM
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Default RE: LED light question

pictures are REALLY blurry, but yea should work

pretty much you will see a flat part in the LED solder the 2 together the big piece is negative, and goes to the negative terminal.
then I'd get 2 resistors, and solder one to each of the other prongs left. Then solder the other end of the resistors together, and hook it to the positive terminal on the battery

Drew a fast picture IMO resistors should be something between 100-1k ohms so they don't fry(just make sure they match). LEDs in parallel will work for a while without a resistor, but I don't recommend it. I've used LEDs without a resistor in parallel and they have lasted anywhere from 20 mins to 10 months non stop use before dying. But remember any damage done will just keep accumulating
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Old 07-30-2011, 08:26 AM
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Default RE: LED light question

okay so i got them desoldered. now i don't understand the rest of what you had said. are the big pieces i need to look at on the inside of the bulbs?
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Old 07-30-2011, 10:15 AM
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Default RE: LED light question

yup

from your pic the LED on the left, the prong on the left that is the negative. you can see the larger some what triangular piece in it
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Old 07-30-2011, 10:18 AM
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Default RE: LED light question

oh okay thanks. so would i take the negative on one bulb and solder it to the negative on the other bulb via a wire?
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Old 07-30-2011, 10:33 AM
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Default RE: LED light question

http://www.sparkfun.com/tutorials/222
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Old 07-30-2011, 12:57 PM
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Default RE: LED light question


ORIGINAL: Evil Genius jr.

http://www.sparkfun.com/tutorials/222
fine if you understand schematics, and which is anode and cathode
I tried making my pic as simple as possible for people not knowing the symbols (ok I used resistors symbol but I wrote resistor above it )
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Old 07-30-2011, 01:22 PM
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Default RE: LED light question

the negative (cathode?) should have a little notch on the casing.
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Old 07-30-2011, 01:22 PM
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Default RE: LED light question

i'm supposed to learn schematics next year in 9th grade....
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Old 07-30-2011, 02:22 PM
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Default RE: LED light question

okay im 100% sure that this is negative to negative, but did i wire it up correctly? and then how will i get the battery terminal to come out of the wire? will i need to strip some from the middle and then add another wire?
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Old 07-30-2011, 03:44 PM
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Default RE: LED light question

oh and now im going to run it off of a 6 cell 7.2v nimh. will i still need to get resistors?
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Old 07-30-2011, 04:01 PM
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Default RE: LED light question

run it off the BEC at that point. get one of the little plugs like on a servo, and plug it into reciever
hook the 2 in series, and use 1 100 ohm resistor
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Old 07-30-2011, 04:11 PM
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Default RE: LED light question

well im not using it for an rc....just something i wanted to try. so would i still need the two resistors if im just running it off of the 6 cell?
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Old 07-30-2011, 05:53 PM
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Default RE: LED light question

no still one but at this point you are going to need to figure out how to drop the voltage down to 6, and wire em in series. Or drop it to 3.2ishV and go for parallel. If you don't it will be VERY bright for like 2-4 seconds than not turn on again
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Old 07-30-2011, 06:15 PM
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Default RE: LED light question

hmm....what if i used this resistor? would it come down enough? or is that too much?

http://www.radioshack.com/product/in...ductId=2062350
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Old 07-31-2011, 04:09 AM
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Default RE: LED light question

[link=http://lmgtfy.com/?q=led+resistor+calculator]calculator[/link]
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Old 07-31-2011, 05:20 AM
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Default RE: LED light question

You REALLY need to find someone that knows a car battery from a nuclear power plant to do this for you!
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Old 07-31-2011, 05:43 AM
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Default RE: LED light question

if you have a android phone download electrodroid it will tell you everything you need to know and plus more . I use it when i modify computer cases and everything else
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Old 07-31-2011, 06:51 AM
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Default RE: LED light question

i got 68 ohms when i used the calculator....
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