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PMDC motor as a generator for low power app. | 8 comments (8 topical, 0 editorial)

Re: PMDC motor as a generator for low power app. (3.00 / 0) (#5)
by Bruce S (bruce(dot)stahl <at>gmail (dot)(com)) on Fri Aug 8th, 2008 at 07:24:46 AM MST
(User Info)

About those LEDs.
Normal LEDs are at full brightness at 20mA, are you using the larger Lux units?
Also, usually best to limit 3 LEDs in a set and use a current limiting resistor, say about 120 Ohms if you go with smaller set of 2 or around 60 Ohms for sets of 3.

Just a thought

Bruce S

[ Parent ]

Re: PMDC motor as a generator for low power app. (3.00 / 0) (#6)
by mystiquesbs (mystiquesbs@gmail,com) on Fri Aug 8th, 2008 at 06:15:36 PM MST
(User Info)

Cheers Bruce,

We are not too worried about the LED's at this moment. We will be purchasing 12V Led waterproof strips or the 12V halogen style LED's depending on what illuminates the sculpture the best. At the moment we are more worried about how we will generate the power to run the LED's. 15-20W is just an estimate but if we can generate power around 20-30W we will be happy.

Another note is that the power does not need to be constant. As this is for a sculpture it could add a nice effect if the LED's were to become duller and brighter depending on the wind speed, to create a breathing effect. And yes there will be a limiter to make sure the current does not blow the LED's in high winds.

Cheers Brent

[ Parent ]

PMDC motor as a generator for low power app. | 8 comments (8 topical, 0 editorial)

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