Community
Search
Notices
RC Car General Discussions This forum is for all general discussions related to radio control cars. Check forums below for more specific categories if applicable.

LED light question

Thread Tools
 
Search this Thread
 
Old 07-27-2011 | 07:00 PM
  #1  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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
Old 07-27-2011 | 07:09 PM
  #2  
SyCo_VeNoM's Avatar
 
Joined: Jul 2007
Posts: 12,987
Likes: 0
Received 44 Likes on 41 Posts
From: North West Indiana
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
Old 07-28-2011 | 05:52 AM
  #3  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
Default RE: LED light question

okay thanks.
Old 07-29-2011 | 04:01 PM
  #4  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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?<br type="_moz" />
Attached Thumbnails Click image for larger version

Name:	Yw67883.jpg
Views:	30
Size:	24.1 KB
ID:	1641720   Click image for larger version

Name:	To44570.jpg
Views:	33
Size:	40.8 KB
ID:	1641721  
Old 07-29-2011 | 05:10 PM
  #5  
SyCo_VeNoM's Avatar
 
Joined: Jul 2007
Posts: 12,987
Likes: 0
Received 44 Likes on 41 Posts
From: North West Indiana
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
Attached Thumbnails Click image for larger version

Name:	Ca82266.jpg
Views:	34
Size:	8.9 KB
ID:	1641732  
Old 07-30-2011 | 08:26 AM
  #6  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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?
Attached Thumbnails Click image for larger version

Name:	Ge94046.jpg
Views:	30
Size:	60.9 KB
ID:	1641956  
Old 07-30-2011 | 10:15 AM
  #7  
SyCo_VeNoM's Avatar
 
Joined: Jul 2007
Posts: 12,987
Likes: 0
Received 44 Likes on 41 Posts
From: North West Indiana
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
Old 07-30-2011 | 10:18 AM
  #8  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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?
Old 07-30-2011 | 10:33 AM
  #9  
Member
 
Joined: Mar 2011
Posts: 97
Likes: 0
Received 0 Likes on 0 Posts
From: ?
Default RE: LED light question

http://www.sparkfun.com/tutorials/222
Old 07-30-2011 | 12:57 PM
  #10  
SyCo_VeNoM's Avatar
 
Joined: Jul 2007
Posts: 12,987
Likes: 0
Received 44 Likes on 41 Posts
From: North West Indiana
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 )
Old 07-30-2011 | 01:22 PM
  #11  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
Default RE: LED light question

i'm supposed to learn schematics next year in 9th grade....
Old 07-30-2011 | 01:22 PM
  #12  
Member
 
Joined: Mar 2011
Posts: 97
Likes: 0
Received 0 Likes on 0 Posts
From: ?
Default RE: LED light question

the negative (cathode?) should have a little notch on the casing.
Old 07-30-2011 | 02:22 PM
  #13  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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?
Attached Thumbnails Click image for larger version

Name:	Bz77048.jpg
Views:	35
Size:	36.0 KB
ID:	1642082  
Old 07-30-2011 | 03:44 PM
  #14  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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?
Old 07-30-2011 | 04:01 PM
  #15  
SyCo_VeNoM's Avatar
 
Joined: Jul 2007
Posts: 12,987
Likes: 0
Received 44 Likes on 41 Posts
From: North West Indiana
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
Old 07-30-2011 | 04:11 PM
  #16  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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?
Old 07-30-2011 | 05:53 PM
  #17  
SyCo_VeNoM's Avatar
 
Joined: Jul 2007
Posts: 12,987
Likes: 0
Received 44 Likes on 41 Posts
From: North West Indiana
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
Old 07-30-2011 | 06:15 PM
  #18  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
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<br type="_moz" />
Old 07-31-2011 | 04:09 AM
  #19  
ImpalaPolicePack's Avatar
Senior Member
 
Joined: Aug 2008
Posts: 1,028
Likes: 0
Received 0 Likes on 0 Posts
From: MONTREAL, QC, CANADA
Default RE: LED light question

[link=http://lmgtfy.com/?q=led+resistor+calculator]calculator[/link]
Old 07-31-2011 | 05:20 AM
  #20  
My Feedback: (118)
 
Joined: Nov 2007
Posts: 445
Likes: 0
Received 0 Likes on 0 Posts
From: Wylie, TX
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!
Old 07-31-2011 | 05:43 AM
  #21  
Senior Member
 
Joined: Sep 2010
Posts: 118
Likes: 0
Received 0 Likes on 0 Posts
From: Parkersburg, WV
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
Old 07-31-2011 | 06:51 AM
  #22  
Thread Starter
Banned
 
Joined: Dec 2010
Posts: 3,488
Likes: 0
Received 0 Likes on 0 Posts
From: Downingtown, PA
Default RE: LED light question

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

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.