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chairman666 · 31-July-03, 08:12 PM

u should make something unique......my idea is a chrome fan with LEDs....start with this fan: http://www.svc.com/80chfan.html and drill holes in it and mount LEDs....it would be an interesting new alternative.....

AntiM · 31-July-03, 10:09 PM

Quote:


	Originally posted by hawklen Mustang, I took the fan out to clean, ran water through it, and used a hair dryer to dry it. The hair dyer made the fan spin, and the LEDs were lighting up without any power. Im just curious to see if you have seen that, and if they are replacable.

The reason the led's light up when you spin the fan is it acts as a small generator. The led's are normally powered off the same current the fan is. Not off the fan itself. Make sense? If you throw a voltage tester on the wires you can measure how much.

Very little difference between the design of a generator and that of a electric motor.

mustangP51 · 31-July-03, 11:19 PM

Yep that makes since now.
Mustang

hawklen · 01-August-03, 08:54 AM

Yup, make sense. I was always curious, if it was just by the fan spinning, or direct current. Thanks.

Twizted · 01-August-03, 10:50 AM

Then it would make since that if you put higher power leds on such a fan that it probably wont light up as bright since it was probably originally designed for lower power leds? I am just pondering ... (have to excuse me I just woke up) but if it were me and I was going to replace my leds with 5mm high current leds I would maybe try this... Leave the originals (if they are the desired color if not replace with 3mm equiv.) and add the others by drilling more holes and via a seperate wire harness that you can intertwine in to the original fan wire and sleeve that way you have even brighter fans no loose of power to the fan and well you get the idea.... Just a thought..

mustangP51 · 01-August-03, 12:29 PM

Nope that is not correct as LEDs all mostly talke 3volts or up to 3.5 or so. The brightness depends on the quality of the chrystle inside the LED. and a couple other things. But the power they LEDs get from the fan is 12volts before the resistor. I take the resistor out and replace it with a 470 ohm resistor so the LEDs are getting 3.3 volts a perfect power level for them.
Mustang

Twizted · 01-August-03, 12:47 PM

I was just thinking lol.. Something I advise against if you have not been up atleast 30 minutes (I had literally just gotten up *PR is my coffee*) but yeah now that I have had time your right.. I failed to mention I was refering to the generator type setups... which could be differant as I would bet they probably dont put out a great deal of current...

31-July-03, 08:12 PM	#21 (permalink)
chairman666 Apex Master Tech Join Date: Jul 2003 Location: Mesa Ar-hoe-zona Posts: 447	u should make something unique......my idea is a chrome fan with LEDs....start with this fan: http://www.svc.com/80chfan.html and drill holes in it and mount LEDs....it would be an interesting new alternative..... __________________

01-August-03, 08:54 AM	#24 (permalink)
hawklen PCApex's Mouthy Stepchild Join Date: Mar 2003 Location: Interia's Bed Posts: 3,623	Yup, make sense. I was always curious, if it was just by the fan spinning, or direct current. Thanks. __________________ The two of us. All used and beaten up Watching fate as it flows down the path we have chose

01-August-03, 10:50 AM	#25 (permalink)
Twizted Editor/Reviewer/LED Guru Join Date: Sep 2002 Location: Eau Claire, WI Posts: 3,347	Then it would make since that if you put higher power leds on such a fan that it probably wont light up as bright since it was probably originally designed for lower power leds? I am just pondering ... (have to excuse me I just woke up) but if it were me and I was going to replace my leds with 5mm high current leds I would maybe try this... Leave the originals (if they are the desired color if not replace with 3mm equiv.) and add the others by drilling more holes and via a seperate wire harness that you can intertwine in to the original fan wire and sleeve that way you have even brighter fans no loose of power to the fan and well you get the idea.... Just a thought.. __________________

01-August-03, 12:47 PM	#27 (permalink)
Twizted Editor/Reviewer/LED Guru Join Date: Sep 2002 Location: Eau Claire, WI Posts: 3,347	I was just thinking lol.. Something I advise against if you have not been up atleast 30 minutes (I had literally just gotten up PR is my coffee) but yeah now that I have had time your right.. I failed to mention I was refering to the generator type setups... which could be differant as I would bet they probably dont put out a great deal of current... __________________

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31-July-03, 11:19 PM	#23 (permalink)
mustangP51 Apex Techie I Join Date: Mar 2003 Location: Missouri Posts: 75	Yep that makes since now. Mustang

01-August-03, 12:29 PM	#26 (permalink)
mustangP51 Apex Techie I Join Date: Mar 2003 Location: Missouri Posts: 75	Nope that is not correct as LEDs all mostly talke 3volts or up to 3.5 or so. The brightness depends on the quality of the chrystle inside the LED. and a couple other things. But the power they LEDs get from the fan is 12volts before the resistor. I take the resistor out and replace it with a 470 ohm resistor so the LEDs are getting 3.3 volts a perfect power level for them. Mustang

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