I modified my car taillight with SMD light same as image, I tried them after installed with 12v DC 1000mA adaptor and was working well, but with car battery not worked, After that I found out The SMD needed 24v power,

Now I need to increase the voltage, Please if any one help me... TQ.

  • 1
    Generally speaking, resistors can only reduce the voltage across a part.
    – duskwuff
    Feb 5 '17 at 6:46
  • @duskwuff , what can I do now....?
    – Kevin
    Feb 5 '17 at 7:49
  • If it works with 12V adaptor and not with a 12V car then you may not be using it in the car as you think you are. Feb 5 '17 at 11:54
  • Image? Can you provide link to SMD lighjt Feb 5 '17 at 11:55
  • Problem solved friend,
    – Kevin
    Feb 5 '17 at 13:19

You can

  • buy a 12VDC to 24VDC converter which is rated for the needed current
  • modify the led unit to operate with 12 volts (fewer leds in series in one strip, double number of strips, new current limiting resistors needed)
  • buy a new led unit for 12V

The last option is the best for maintaining the reliability of your vehicle. Nothing that's made by unexperienced hobbyists will be good enough for cars.

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