how to DIY undercarridge LED light?

Discussion in 'Do-It-Yourself Garage' started by sonictheory, May 29, 2006.

  1. khguan

    khguan Senior Member
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    eh.. it will be abandone for some time... heheh.. no time to do it yet...

    all just normal LEDs... using a 1Kohm resistor to reduce the voltage..
     
  2. jaywat

    jaywat Senior Member
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    khguan become damn expert already la.. from fluorescent light to LED undercarriage already
     
  3. khguan

    khguan Senior Member
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    eh... no expert la... mine very simple circuit only... will abandon this project for sometime... got free time only do...
     
  4. SkYwAlKeR

    SkYwAlKeR Senior Member
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    haha... why abandon la??... let us see the result ma... hahaha.... actually i also lazy do lar... i got the LEDs adi... all components got oledi... but, do i really need it??... will it affect my battery load??.... scared use too much power, battery kong vr fast....
     
  5. khguan

    khguan Senior Member
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    wun la... LEDs consume very very very little current.... lesser than ur alarm system...
     
  6. ninja_iga

    ninja_iga Senior Member
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    dude

    so by using a resistor(s?) you can change 12volt to 6 volt?
     
  7. SkYwAlKeR

    SkYwAlKeR Senior Member
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    hmm.... if so, might try la.... install adi become lala chai also nvm.... hahaha...

    *my friend say cars with undercarridge lights are lala chai car*
     
  8. SkYwAlKeR

    SkYwAlKeR Senior Member
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    this i also not sure ler sifoo... coz as far as i know, resistor only reduce current... if to reduce voltage, u need a voltage regulator.....
     
  9. wyx

    wyx 15 Year | Platinum

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    to halve the voltage, try connect this way with R1=R2.

    12Vdc --R1-------o-----6Vout
    |
    R2
    |
    Gnd

    PS: connect R2 to Gnd at the mark o. I can't align the lines to its exact conenction :P
     
    #29 wyx, Jun 20, 2006
    Last edited: Jun 20, 2006
  10. khguan

    khguan Senior Member
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    errr.. i guess using 680ohm should be fine... connect in series... but this is only applicable for LEDs as the load is very small... for stuff with higher current load, iti s not suitable to use resistor...
     
  11. tylaxng

    tylaxng Senior Member
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    Erm.. no recommend using this way to get 6Vdc, output voltage easy to change when load parallel connect with R2.

    Try using LM317 - Adjustable Regulator, u can get the stable 6Vdc voltage with few passive components in circuit....

    LM317 Datasheet
     
  12. wyx

    wyx 15 Year | Platinum

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    For constant current load with very low current, like driving LEDs, use resistor to drop the volatges is fine.
    If intended to use the 6V to drive variable load, then using LM317 to regulate the Vout is preferred. If intended to drive heavy load, then use LT1083-5 which can supply up to 7.5A. It's all depends on the application.
     
  13. tylaxng

    tylaxng Senior Member
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    yup.. wyx... i agree with you....

    but the schematic that you provided, i dont think it's suitable to drive the LED, maybe you just want to show how to easily get the 6Vdc by using few resistors.... but it's under w/o load(LED) condition. When there is a load... it's another thing... i just dont want other people to get confused... coz not every people has the basic knowledge of electronic....

    just my 2 cents.. hope that u don't mind... :regular_smile:
     
  14. nitrus

    nitrus Senior Member
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    oh my god u guys .... lighting/wiring technician issit ??? lolzzz.... i dun know a single thing u're saying ... damn ..... wat dunno wat volt la this n that ....... goin crazy... :rofl:
     
  15. SkYwAlKeR

    SkYwAlKeR Senior Member
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    hahaha.... all engineer are talking.... i also keep silent only.... i noobie.....
     
  16. nitrus

    nitrus Senior Member
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    we noobies ... jom lets just go mamak n yamcha watch football hhahaahaha!! :rofl: maybe can teach the satay stall sellers how to install neon lights under their stalls or somethin....
     
  17. SkYwAlKeR

    SkYwAlKeR Senior Member
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    haha.... later they say no need la.... they got charcoal red hot light.... no need neon.... lolz....
     
  18. mivecmerah

    mivecmerah Senior Member
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    hehe...wut about using spotlight...i got one....is it ok?
     
  19. khguan

    khguan Senior Member
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    spot light not ok....

    they consume lots of current.. n heats up alot... if kena flood.. then gone... if the heat gets to the fuel line... u are gone...
     
  20. wyx

    wyx 15 Year | Platinum

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    no pblm tylaxng, we just share-share and learn idea here :)

    to those who likes to play with LEDs but not too familiar with them, try this to calculate the required resistor value for your circuit. Have fun :)
     

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