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You are here: Home / Car and Motorcycle / How to Make Car LED Bulb Circuit

How to Make Car LED Bulb Circuit

Last Updated on December 8, 2019 by Swagatam 7 Comments

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Typically all car turn signal lamps are around 12 to 20 watt rated which are traditionally incandescent bulb types and produce much lower light intensities compared to LED lights. Here we learn how these lamps can be replaced with high efficiency, high intensity car LED bulbs.

LED Car Bulb Design

The image below shows what could be a car LED lamp directly replaceable over the existing holder.

It shows a decent looking arrangement of flat, tiny SMD LEds in a circular pattern for enabling optimal distribution of light via the enclosed hind reflector.

The LED used here are the 3020 SMD LEDs, these tiny light emitting diodes are identical to the ordinary 5mm LEDs with their specs, however if we compare their light intensities, the witnessed difference appears to be huge, where the 3020 easily wins by an outstanding margin, that's why these LEDs are much preferred in place of the ordinary 5mm LEds nowadays.

Technical Specifications of the 3020 LEDs are:

  • Forward voltage: 3 to 3.2V
  • Forward current: 30mA optimal
  • Luminous Efficiency: 100-110lm/w
  • Size: 3.0x2.0x1.3mm
  • Lifetime: 50,000hrs
Making car LED bulb circuit using SMD LEDs

Construction

In the above image, we can see the LEDs assembled over pcs of PCB strips, tiled in a particular calculated manner.

The vertical PCBs are 7 in numbers, and have 4 LEDs on each strips.

One circular PCB consisting of 22 LEDs can be seen positioned over the vertical PCB structure.

The vertical PCBs thus include 7 x 4 = 28 nos of 3020 LEDs, while the circular PCB mount 22 nos of LEds, giving a total of 28 + 22 = 50 LEDs

These 50 LEDs are connected to form 12 strings of 4 LEDs each, and a single string of 2 LEds.

Each of the 12 strings must have their own individual series resistor (SMD) whose value could be around 55 ohms 1/4 watt.

The single 2 LED string must associate a separate 250 ohm, 1/4 watt resistor.

These resistors act like current limiters for safeguarding the LEds from car alternator voltage fluctuations and also help to keep the illumination level across all the LED groups as uniform as possible.

The resistors can be installed at the rear side of the PCB strips.

The circuit diagram for the proposed simple car LED lamp is shown below:

Circuit Diagram

simple car LED bulb circuit using 3020 SMD LEDs
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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Abdul Basit Momin says

    October 22, 2019 at 12:45 am

    How can we make 50 led string in series of this bulbs

    Reply
    • Swagatam says

      October 22, 2019 at 10:16 am

      Make 16 strings having 3 series LEDs with a calculated resistor. Then connect all the strings in parallel with 12V supply

      Reply
      • Abdul Basit Momin says

        October 23, 2019 at 10:52 am

        And how will the circuit for 230v

        Reply
        • Swagatam says

          October 23, 2019 at 2:15 pm

          for 230V connect all of them in series and use the first circuit from this article to control it

          https://www.homemade-circuits.com/how-to-make-led-bulb-circuit/

          Reply
  2. satheesh k Nalluswamy says

    May 3, 2016 at 9:48 am

    Thanks for your help

    Reply
  3. satheesh k Nalluswamy says

    May 2, 2016 at 1:40 pm

    Dear sir,
    please provide above the led resister calculation

    Reply
    • Swagatam says

      May 3, 2016 at 3:35 am

      Dear Satheesh, you can use the following calculator for knowing the results:

      https://www.homemade-circuits.com/p/led-resistor-calculator_21.html

      Reply

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