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  • Powering L.E.D.'s

    Hey, i am looking into power some 5mm leds on a 12v line.
    http://www.radioshack.com/product.as...t%5Fid=276-311

    How would i go about hooking them up to 12v? They at max at 6v?
    2002 Mitsubishi Galant
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  • #2
    Always use typical voltage, if your connecting them in a computer, use the 5v (duh lol)
    If you dont get those l.e.d.'s or use a 12v source(regulated) use my favorite calculator :

    http://metku.net/?sect=view&n=1&path...calc/index_eng

    Supply voltgage = 12v
    Voltage Drop Across LED =5v
    Desired LED Current= 20ma(not 30 thats the max and I think the led will burn up)
    How many leds connected= How many leds connected ?

    If you get l.e.d.'s that are under 5v (3.6v usually) use the 5v source if in a computer(so you dont have to buy a over 1watt resistor)

    Btw if you want inexpensive but good led's : go on ebay and search for a user called besthongkong :

    http://search.ebay.com/_W0QQsassZbesthongkong

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    • #3
      Originally posted by kevinlekiller
      Always use typical voltage, if your connecting them in a computer, use the 5v (duh lol)
      If you dont get those l.e.d.'s or use a 12v source(regulated) use my favorite calculator :

      http://metku.net/?sect=view&n=1&path...calc/index_eng

      Supply voltgage = 12v
      Voltage Drop Across LED =5v
      Desired LED Current= 20ma(not 30 thats the max and I think the led will burn up)
      How many leds connected= How many leds connected ?

      If you get l.e.d.'s that are under 5v (3.6v usually) use the 5v source if in a computer(so you dont have to buy a over 1watt resistor)

      Btw if you want inexpensive but good led's : go on ebay and search for a user called besthongkong :

      http://search.ebay.com/_W0QQsassZbesthongkong
      Actually i am not hooking them up to my computer. I am hookinh them up to my cigaretter lighter ring. There is a ring around it the gives off a white light i wanna i wanna put some bright blue led's in there. Which ones should i get? How many volts are those on the ebay site u gave me?

      I could get 4 3v leds and wire them in series and that wil give me 12V
      2002 Mitsubishi Galant
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      • #4
        I see , the ones on ebay are 3.6v max 3.3 typ, 3volt is fine id say min 2.5.

        But you cant run the led's the way you are thinking.

        The car when started is about 14.4v and when off is about 12v, plus the voltgae is instable(sometimes there are spikes; wich means voltage goes up very high for a moment) Wich in other words means: You need to regulate the voltage before sending it to the led's.

        You can do this by getting a 12v in - 5v out regulator(this would = no resistor). Or get a cig lighter adapter(12v - 5v) and hard wire it to the battery like how I said in the other thread(these you can get in 1 dollar stores; cell phone stuff).

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        • #5
          OK well the LED's i am going to get:
          http://cgi.ebay.com/Blue-LED-100-x-1...QQcmdZViewItem

          they are 3.2V. I want to get 4 of them and wire them up to the ORIGINAL 12v power line. How would i do this. You are saying at a 12v-5v regulator? But they are all 3v.
          2002 Mitsubishi Galant
          Progress: 90% [-▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓- ->

          Carputer Specs:
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          60GB HDD
          Souund Blaster Audigy2 NX
          OPUS ITX PC Case

          Comment


          • #6
            Ok check this out:



            This is how i plan on doing this....
            2002 Mitsubishi Galant
            Progress: 90% [-▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓- ->

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            60GB HDD
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            • #7
              Ummm... $3 per LED! You're getting RAPED!
              LSDIODES has better prices. Also check ebay.

              How to power... I posted a thread about this in hardware development a while back.
              PowerVoice v1 | NaviVoice Source
              GammaControl v2.4
              SKINbedder v3

              1995 Lexus SC300

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              • #8
                Originally posted by 0l33l
                Ummm... $3 per LED! You're getting RAPED!
                LSDIODES has better prices. Also check ebay.

                How to power... I posted a thread about this in hardware development a while back.
                first seach on ebay returns 100 for $15
                I have found you an argument; I am not obliged to find you an understanding.

                Comment


                • #9
                  Originally posted by 0l33l
                  Ummm... $3 per LED! You're getting RAPED!
                  LSDIODES has better prices. Also check ebay.

                  How to power... I posted a thread about this in hardware development a while back.

                  Hey,

                  I am used that calculator u posted. But i was just wondering, did you use a resistor in your setup? I am going to be using 4 3mm leds.

                  Here are there specs
                  Code:
                  DC forward voltage : VF (IF =20mA)
                  	
                  
                  3.2V-3.4V Typ, 3.8VMax
                  
                  DC reverse current : IR (VR =5V)
                  	
                  
                  100uA
                  
                  Intensity luminous : Iv (IF =20mA)
                  	
                  BB13 : 8000-11000mcd
                  
                  Wavelength : Wd (IF=20mA)	465-470nms:
                  is this the correct way to wire them:


                  Also in the right part of the diagram. The 2 brown resistors and then there is that circle what does that mean? Are the resistors on the same line?
                  2002 Mitsubishi Galant
                  Progress: 90% [-▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓- ->

                  Carputer Specs:
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                  60GB HDD
                  Souund Blaster Audigy2 NX
                  OPUS ITX PC Case

                  Comment


                  • #10
                    when i calculate on how to wire them up, do i type in the max? For instance

                    The LED im looking at has:

                    min = 2.8

                    typican - 3.3

                    max 3.8.

                    also typical foward current it 20

                    max is 30

                    which do i calculate?
                    2002 Mitsubishi Galant
                    Progress: 90% [-▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓- ->

                    Carputer Specs:
                    Via M10K
                    512mb Ram
                    60GB HDD
                    Souund Blaster Audigy2 NX
                    OPUS ITX PC Case

                    Comment


                    • #11
                      where should the resistor be placed? On the 12v line or the ground?
                      2002 Mitsubishi Galant
                      Progress: 90% [-▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓- ->

                      Carputer Specs:
                      Via M10K
                      512mb Ram
                      60GB HDD
                      Souund Blaster Audigy2 NX
                      OPUS ITX PC Case

                      Comment


                      • #12
                        Originally posted by Cheekz185
                        Hey,

                        I am used that calculator u posted. But i was just wondering, did you use a resistor in your setup? I am going to be using 4 3mm leds.
                        Yeh, my grandpa convinced me to use a resister
                        PowerVoice v1 | NaviVoice Source
                        GammaControl v2.4
                        SKINbedder v3

                        1995 Lexus SC300

                        Comment


                        • #13
                          Did u put the resistor on the positive or negative wire?
                          2002 Mitsubishi Galant
                          Progress: 90% [-▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓- ->

                          Carputer Specs:
                          Via M10K
                          512mb Ram
                          60GB HDD
                          Souund Blaster Audigy2 NX
                          OPUS ITX PC Case

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                          • #14
                            Sorry was sleeping, Im here now . Remember use a regulated source, since the car is NOT = 12v (it can go up to 100v for a plit second wich burns the L.E.D.'s).

                            On a led a Leg(to power them) is alwats longer than the others ; this is the positive. Also if you look inside the glass you will see two pieces of metal ; the smaller one is the positive.

                            You put the resistor like this : 12v+ ...... Regulator ....... Resistor .....+ L.E.D. -....... Ground.

                            I suggest you put them in paralell.

                            And Btw I must say again: use a regulator :P Because if the LED Max is 3.6v if it goes to 3.7v the LED is done(it will be very dim) If the voltage goes very high(4 volts and more) than it will explode and smell plastic ****.

                            Comment


                            • #15
                              Originally posted by 0l33l
                              Ummm... $3 per LED! You're getting RAPED!
                              LSDIODES has better prices. Also check ebay.

                              How to power... I posted a thread about this in hardware development a while back.
                              LSDiodes are expensive , but their diodes are good quality and they have great customer service + they give free sticker lol.

                              Comment

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