Thanks to this old thread, I made my own LED backlight!

Bro i want a help from you.
I've installed HID on my Twister before one month but now the battery is getting down.So i want to rewind the coil, in chennai who ll do the job could you please help me

yeah, I do get uniform brightness from all LED's & resistor values are provided in the diagram

ckt diagram of my LED clusterhttps://www.facebook.com/photo.php?f...type=3&theater

brake lamp only
https://www.facebook.com/photo.php?f...type=3&theater

tail+brake lamp (brightly illuminated)
https://www.facebook.com/photo.php?f...type=3&theater

^^ What resistance values did you use, and most importantly did you get uniform lighting from all the LEDs?

Same LED's used as both parking & brake lamps is easier to fabricate. I have done that... Its damn easy.

Help on Rewinding

Bro i want a help from you.
I've installed HID on my Twister before one month but now the battery is getting down.So i want to rewind the coil, in chennai who ll do the job could you please help me

Just connect the 2 wires from the multimeter to the 2 legs of any LED while the ckt is powered ON. Measure the voltage. It should be in 2-3V range. Repeat this for different LEDs and check.

Smoking is a alternative. Let us know how it goes.

Checked the bike's battery's voltage with a multimeter. Showed 14.5v. Added more resistors to the mix and mounted the LED tail light on the bike.

I still don't get how to check the voltage rating of the LEDs. Can you tell me what to do with the multimeter so that I can check that. Also Need to know about the current.

I'm not using the red shield. The board shows from outside but I plan to smoke the tail in a couple of days anyways so it won't be a problem.

time for pics:






Only the running light is showing in these pics as I didn't have an assistant to pull in the brake lever while I clicked pics.

I doubt that Rahul.. Are you talking about the stock Pulsar LED tail lights? Then its a No. There are only one set of LEDs.
The glow is dim when on normal pilot lamp and headlight mode and they become dark (the voltage is increased, i'm not sure) on pressing the brake light. That's how they work.

No two separate rows for braking and normal tail lights. I guess there are 5 SMDs on each row of the brake light setup.. Don't remember exactly.

i had made custom led tail lamps for my unicorn..

'm uploading some pictures...

this is the park light.. brake lights are of good brightness


at night

Thanks. I've done the math of the resistor size keeping in mind some presumptions: 1. bike gives a constant 12 volts of power to the tail lamp
2. I'm using 2 volt LEDs
3. Current passing through the LED is .02 amperes.

What's the voltage that the bike provides while it's running? Does that voltage changes according to rpms?

How do I check for voltage running across the individual LEDs?

How can I check how much current is flowing through the LEDs? i.e. whether my assumption of .02 amperes is correct or not.


Take the red shield off. Will increase the illumination.

And one resistor per LED. That does seem like a LOT of work.

Looks nice! But 100 Ohms seems a bit less. While the circuit is running on the bike, measure the voltage across the individual LEDs. It should not be much more than 3V across each LED.

Oh, and here is how it looks on my R15 -



The middle row is for the running light, and the other 2 rows are for the the brake light.



I used 1 resistor per LED. The lesser the LEDs you string per resistor, the lesser is the effect of source voltage on the LED brightness. This eliminates any slight dimming during horn usage etc.



And yes, its difficult to solder!



Only the running light ON. Not the best pic!

I tried this method and am kinda stuck on the diode and capacitor part.

LEt me explain further. I assumed that the voltage that the bike provides to the tail lamp would be a constant 12volts. So i used ohm's law and figured out that I needed a single 100 ohm resistor per array of 5 LEDs connected in series. The math:

I=V/R

R=V/I

R={12-(2x5)}/.02

R=100

Hence the use of a 100 ohm resistor.

I made 2 arrays, 1 for brake light and 1 for running light.

Here pics of what I've done so far:

The brake light only :



The running light only:







Running and brake light together:




Now the part where I'm stuck on.

1. I don't understand is why did you have to use the capacitor and the diode in the first place.

2. Also, as per the wiring diagram, the capacitor is wired in the circuit for the running light only. If it is required then it must be required for BOTH the running light and the brake light circuits. Is it due to the fact that while the running light shall be on most of the time, the brake light shall be on a very little margin of the running time?

3. I do not see a capacitor in the image that you've uploaded, or am I missing something?

4. I do not understand how you've wired the diodes. Can you explain the circuit diagram to me?

5. I see the capacitor has been wired between the positive and the negative wires on the running light circuit. Would it be wired the same way in the braking light circuit if I decide to use a capacitor and diode combo on the brake light circuit too?

Its from a LED calculator web site.