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Author Topic: Dim LEDs  (Read 6089 times)

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Erkeli

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Dim LEDs
« on: March 01, 2008, 00:29:35 AM »
Ok, this is tricky

Can somehow dim an Led?

kam

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Re: Dim LEDs
« Reply #1 on: March 01, 2008, 00:49:04 AM »
Why don;t you try the result of a PWM on a led. it may satisfy you.

kostas

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Re: Dim LEDs
« Reply #2 on: March 01, 2008, 11:01:35 AM »
Actually, powering a led with switching voltage, by changing the frequency you get some kind of dimming

kam

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Re: Dim LEDs
« Reply #3 on: March 01, 2008, 13:34:59 PM »
Exactly.
An oscillator (some hundreds hertz) have good results. You can either change the frequency or the duty cycle (that is preferable)

ScubaCap

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Re: Dim LEDs
« Reply #4 on: March 01, 2008, 17:49:34 PM »
Changing voltage can also dim leds. I try it with a potentiometer but i think i do not have the proper one because it dims in a really small area of the potentiometer.
If you need just to have permanent dim (and not changing it) use only resistors (or just diodes that will drop each one by 0.7 volts)


Alex

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Re: Dim LEDs
« Reply #5 on: March 01, 2008, 22:46:35 PM »
prefer the pwm and not the voltage. You have a really small area to control brightness of a led.

Erkeli

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Re: Dim LEDs
« Reply #6 on: March 02, 2008, 01:29:52 AM »
Guys thank you very much. I will try every method. I have already jfound a nice pwm to try.

zolotas

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Re: Dim LEDs
« Reply #7 on: June 05, 2009, 21:04:51 PM »
Can this work also with normal 220 lamps? Sorry to cut you  :D

kam

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Re: Dim LEDs
« Reply #8 on: June 05, 2009, 22:07:53 PM »
No.

You have already post a same post that i already answered. No need for doubling.

zolotas

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Re: Dim LEDs
« Reply #9 on: June 13, 2009, 09:24:50 AM »
sorry