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  • #1

    LED connection help .

    Hello xbhpians , i am making a custom build brake light with smd led's . In local market here i found no smd led so from a mechanic i got a pulsar digital speedo meter to get that led's removed from it & use in my brakelight , bt got confused with the red bigger smd led's there they have 4 terminals , left side bottom terminal is found to be positive while others are negative , for testing i used 3 volt supply & connected to those leds with positive wire at bottom left terminal & negative to any of three terminal , it glows but not fully as it glows on bike tried all three negative terminals together too but no brightness is found , I don't want to get them defused by giving more power than capacity . if anyone knows how much power should i supply to get full brightness or any extra thing need to do ?
    Tags: None
  • #2
    Query approved.

    We need grammar and punctuation help too.
    (Been There Done That) x 3.25

    Comment

    • #3
      Originally posted by sunilg View Post
      Query approved.

      We need grammar and punctuation help too.
      Thanks for approval .

      And sorry for writing mess up but atleast that let some words from you , otherwise nothing than "Query approved." Just Jocking

      Comment

      • #4
        Most of the leds will get damaged while desoldering if it is not removed within 4 secs.

        Are you sure you want to illuminate the rear stop light using this tiny-miny SMD leds ??
        If you really want to illuminate using this size of leds ,then you will require at-least 30 smds and
        How will you install them ? On specifically etched PCB ?
        That's going to take a lot of time and money to source smds and to make pcb.

        You can consider 1 watt cree led emitter ,that should give you a lot of illumination or use cheap leds and mount them on a general purpose PCB.

        BTW, for which bike are you going to do this ?

        Comment

        • #5
          Originally posted by Above_All View Post
          Hello xbhpians , i am making a custom build brake light with smd led's . In local market here i found no smd led so from a mechanic i got a pulsar digital speedo meter to get that led's removed from it & use in my brakelight , bt got confused with the red bigger smd led's there they have 4 terminals , left side bottom terminal is found to be positive while others are negative , for testing i used 3 volt supply & connected to those leds with positive wire at bottom left terminal & negative to any of three terminal , it glows but not fully as it glows on bike tried all three negative terminals together too but no brightness is found , I don't want to get them defused by giving more power than capacity . if anyone knows how much power should i supply to get full brightness or any extra thing need to do ?

          According to me, you are not getting full illumination due to 3 volt supply. I guess you should try 4.5, 6, 12 volts...I guess 12 volts will give maximum brightness provided that the LED doesn't blow off
          And yes, where will you tuck those bulbs in the brake light panel?

          Comment

          • #6
            Originally posted by shoeb2015 View Post
            Most of the leds will get damaged while desoldering if it is not removed within 4 secs.
            Don't know that but they are fine & i am not doing this first time

            Originally posted by shoeb2015 View Post
            Are you sure you want to illuminate the rear stop light using this tiny-miny SMD leds ??
            If you really want to illuminate using this size of leds ,then you will require at-least 30 smds [/QUOTE]

            Yes i want to use it for brake light , there are already available but too costly , for e.g. check this 1157 RED 9-SMD/LED STOP BRAKE LIGHT WEDGE 2057/7528 | eBay

            Originally posted by shoeb2015 View Post
            How will you install them ? On specifically etched PCB ?
            Using a 1157 connector , on a pcb etched by me .

            Originally posted by shoeb2015 View Post
            That's going to take a lot of time and money to source smds and to make pcb.
            I have got the pulsar digital speedo meter whose smd led i am going to use as i said in first post & made this thread getting info on those led's pin details & supply need .

            Originally posted by shoeb2015 View Post
            You can consider 1 watt cree led emitter ,that should give you a lot of illumination or use cheap leds and mount them on a general purpose PCB.
            Already made & used them before some months but its booring now , want some work to be done .

            Originally posted by shoeb2015 View Post
            BTW, for which bike are you going to do this ?
            1157 connector bulb is used on most of bike for brake light , i am gonna use it on passion.

            Originally posted by sunny_ View Post
            According to me, you are not getting full illumination due to 3 volt supply. I guess you should try 4.5, 6, 12 volts...I guess 12 volts will give maximum brightness provided that the LED doesn't blow off
            I don't want to blow any of those smd led's as there are limited in pulsar speedo , so i asked help for supply details & ternimals need to be connected .

            Originally posted by sunny_ View Post
            And yes, where will you tuck those bulbs in the brake light panel?
            1157 is a general connector for brake light so with help of it making the plug & play smd led brake light .
            Last edited by Above_All; 01-03-2012, 11:44 PM.

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            • #7
              For how much did you get that used Digital speedometer from mechanic?or did u get for free ?

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              • #8
                Above_All,
                I think the SMD LED's have 2 +ve & 2 -ve leads, then maybe you'll get good illumination.
                Its the fusion of a two wheeled machine & a human being which creates a true biker.

                Fine me on facebook: https://www.facebook.com/krazzykid.abhijeet

                Pulsar spare parts price list (indicative only):
                http://www.scribd.com/doc/42303845/P...re-Parts-Price
                http://www.scribd.com/doc/99085008/Bajaj-180-Pulsar-UG3

                Comment

                • #9
                  Originally posted by shoeb2015 View Post
                  For how much did you get that used Digital speedometer from mechanic?or did u get for free ?
                  Free Mechanic is friend & happy to help me anytime as i help him if he got stuck with wiring , electricals of any bike .

                  Actually i bring that speedo to check how connections are for each unit on display as have a plan to convert analog speedo to digital one for him , but that's really nice pcb & nice work done , not letting to configure it , so meanwhile doing this smd brakelight build up for change .

                  Originally posted by Abhijeet Bhattacharjee View Post
                  Above_All,
                  I think the SMD LED's have 2 +ve & 2 -ve leads, then maybe you'll get good illumination.
                  Will check for it once again , but on my checking for last times one leg is positive while found other 3 as negative .

                  Comment

                  • #10
                    You can try dome type led such as in
                    xBhp.com : The Global Indian Biking Community
                    http://www.xbhp.com/talkies/do-yourself/19524-diy-led-indicator-bulbs.html


                    Alternatively , you can buy led strips and then de-solder/remove the smd leds.

                    AS far as voltage of leds of pulsar speed is concerned check this out
                    Apply a voltage of 12v here and then check the voltage at the terminals of led using a DMM.



                    Image Courtesy Rahul devnath
                    xBhp.com : The Global Indian Biking Community
                    http://www.xbhp.com/talkies/desi-bikes/11969-changing-backlight-colour-lcd-speedo-console-pulsar.html

                    Comment

                    • #11
                      shoeb thanks for the image & link , just connected 12 v power supply to those terminals , but none of the small orange smd led's glowing , & i already removed the red big 4 terminals smd led . So no light is coming after connecting 12 volt supply .

                      Comment

                      • #12
                        Try powering the digi-speedo by supplying 12 volts to
                        pin 20 and pin no 2(+ve)
                        and
                        pin 11(-ve).

                        Ok, now for converting passion to pulsar speedo
                        Connect the low side of H.T coil to pin no 10. to run the tacho.
                        ..
                        ..

                        First power it up then I will let you know about the rest of the pins

                        Comment

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