20 Watt LED Dimmer Circuit diagram

[Narendrakd]

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

 

[Martaine2005]

I want to design 20 watt led dimmer circuit diagram

Upload the circuit you have designed and somebody will help you!

 

[Narendrakd]

yes martaine u r right so i am uploading it...

 

[Narendrakd]

I ried this but the leds are not bright.

All 1W leds are connected to series with 1k register

 

[Martaine2005]

So where and how are the 1W leds connected, and how many?

 

[Narendrakd]

The LED icon will be replaced with 20 leds with different board

 

[Martaine2005]

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.

 

[Narendrakd]

Martaine can you upgrade the circuit diagram

 

[Narendrakd]

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

 

[CDRIVE]

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

 

[Martaine2005]

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/

 

[Narendrakd]

Hi this will be in series and less are 1watt each i.e 20 watts.

 

[CDRIVE]

This was Marty's questions:

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/

This was your reply:

Hi this will be in series and less are 1watt each i.e 20 watts.

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

 

[Narendrakd]

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.

 

[CDRIVE]

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

 

[Narendrakd]

so pl draw a diagram for me please

 

[Alec_t]

The diagram would need to be based on answers to the questions you have been asked. The ball is in your court.

 

[Colin Mitchell]

Here is the PCB:

 

[Martaine2005]

Colin, you jumped in too quickly...
I was slowly leading https://www.electronicspoint.com/threads/led-pwm-driver.230256/

Martin

 

[CDRIVE]

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!

Chris