High Power LED Dimmer

WTP Pepper

Active Member

• Jul 25, 2012

• #21

Not high power LEDs, but you have 36 of them. That's a high power circuit. PWM would be the more efficient method.

 

D

duda123

Member

• Jul 25, 2012

• #22

Ok!
Thank you very muuuuchhhh!!
I'll order the parts right now and I'll post here as soon as I put everything together!

If you ever need help with video editing/pascal programming, just let me know!

And again, thanks a lot!

 

Last edited: Jul 25, 2012

ronv

Well-Known Member

Most Helpful Member

• Jul 25, 2012

• #23

Good luck!
Keep in touch.

 

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duda123

Member

• Jul 25, 2012

• #24

Ah! What about the resistor? 1/4w?
Thanks again!

Edit:
Ouch! They don't have the TIP120 on stock
What should I do now? Can I use the TIP110 instead?

 

Last edited: Jul 25, 2012

ronv

Well-Known Member

Most Helpful Member

• Jul 25, 2012

• #25

Should work.

 

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duda123

Member

• Jul 25, 2012

• #26

Ok!
Thank you!

 

S

shailendra tripathi

New Member

• Aug 3, 2012

• #27

shailendra

dear friends ,

i am designing a project of led driver for three types of led 1200 .i designed a circuit of parallel and series combination and used resistors.
now my problem is that for application it is required to continue on all the led for 9 -10 hours

so i dont think that there is the requirement of PWM dimmer can i use dierectly a potentiometer for dimming or i have to design pwm circuit.

please reply ASAP


regards
shailendra

 

D

duda123

Member

• Aug 3, 2012

• #28

I'll answer with my basic knowledge...
I believe if you use the potentiometer directly the leds are going to burn quickly, since you cannot control both current and voltage using a single potentiometer!

 

S

shailendra tripathi

New Member

• Aug 3, 2012

• #29

thanks

for your quick response.Now if i wants to continue on all these leds for more than 8 to 9 days on the full current and voltage .there may be some damages due heating or not ?
and what should i do for regulation of current and voltage both

regards
shailendra tripathi

 

D

duda123

Member

• Aug 4, 2012

• #30

Hm... If you're using the PMW Dimmer Circuit developed by ronv, you should probably use a heatsink and maybe a small fan. Ronv recommended that I use a heatsink.

 

audioguru

Well-Known Member

Most Helpful Member

• Aug 4, 2012

• #31

A cheap poor quality LED can look bright when its case focusses the light beam into a narrow angle.
Good LEDs are bright over a wide angle.