Connect with us

20 Watt LED Dimmer Circuit diagram

Discussion in 'LEDs and Optoelectronics' started by Narendrakd, Dec 3, 2015.

Scroll to continue with content
  1. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    Hi All,

    I want to design 20 watt led dimmer circuit diagram so can any one please provide me PCB diagram so that i will make PCB and assemble it.

    Thanks in advance

    Narendra
     
  2. Martaine2005

    Martaine2005

    3,069
    843
    May 12, 2015
    Upload the circuit you have designed and somebody will help you!
     
  3. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    yes martaine u r right so i am uploading it... final.jpg
     
  4. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    I ried this but the leds are not bright.

    All 1W leds are connected to series with 1k register
     
  5. Martaine2005

    Martaine2005

    3,069
    843
    May 12, 2015
    So where and how are the 1W leds connected, and how many?
     
  6. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    The LED icon will be replaced with 20 leds with different board
     
  7. Martaine2005

    Martaine2005

    3,069
    843
    May 12, 2015
    I don't think that will work!
    I think you need to design this again including a transistor and powering the leds from 12v rails.
     
  8. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    Martaine can you upgrade the circuit diagram
     
  9. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    led final.jpg


    Hi Martaine how about above diagram..i think this will also work but when i designed this its working but leds are lit when pots are at mininum level.

    so can u upgrade this for better
     
  10. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    I don't see any LED current limitting resistors in that circuit. Are they integral to the Led array?

    Short the Gate to Source to test the FET. The LEDs should turn off.

    Chris
     
  11. Martaine2005

    Martaine2005

    3,069
    843
    May 12, 2015
    I think you need to read how to wire leds in series/parallel.
    Your homemade diagram is much better than your 'other' design.
    But you have to know the specifications of your leds. Are they 3.5v and 350ma each?
    What would be the resistor value?
    Would you need 1 watt or 2 watt resistors?
    Can you put three or four in series? (12v)...

    https://www.electronicspoint.com/resources/got-a-question-about-driving-leds.5/
     
  12. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    Hi this will be in series and less are 1watt each i.e 20 watts.
     
  13. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    This was Marty's questions:

    This was your reply:
    What does this mean? We still don't know the color of your LED's which dictate their voltage drop. Also, your schematic indicates 24 LEDs ... not 20.

    Did you short the Gate-Source to test the FET as I suggested?

    Chris
     
    Martaine2005 likes this.
  14. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    see i am new to this and i am trying to make a dimmer led lights for my fish tank so if you guys can send me new diagram with pcb print it will help me lot.

    i want to connect 20watt leds on this tank.
     
  15. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    Repeating the same requests is becoming tiresome to read. You seem to have an aversion to answering our questions.

    BTW, your 25KΩ pot may be too low for the persistence of your eyes to perceive a change in LED brilliance.

    Chris
     
    Martaine2005 likes this.
  16. Narendrakd

    Narendrakd

    11
    0
    Dec 3, 2015
    so pl draw a diagram for me please
     
  17. Alec_t

    Alec_t

    2,909
    791
    Jul 7, 2015
    The diagram would need to be based on answers to the questions you have been asked. The ball is in your court.
     
    Martaine2005 likes this.
  18. Colin Mitchell

    Colin Mitchell

    1,417
    313
    Aug 31, 2014
    Here is the PCB:

    555-PWM.gif
     
  19. Martaine2005

    Martaine2005

    3,069
    843
    May 12, 2015
  20. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    651
    May 8, 2012
    Colin, that's a perfect PCB for him. Now he doesn't have to answer any questions and he can fill in the values himself!:p

    Chris
     
    Arouse1973 and Martaine2005 like this.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-