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Topic: Controlling 2-4 LED's (Read 808 times) previous topic - next topic

SouthernAtHeart

Would this RFP30N06LE MOSFET work for turning 2-4 LED's in series or parallel  on/off with 1 pin?

http://www.sparkfun.com/products/10213

MarkT

Definitely - and they could be powerful LEDs too if you want (1, 3, 5W luxeons or similar).  You will need current-limiting resistors and an appropriate power supply naturally.
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Grumpy_Mike

Quote
and they could be powerful LEDs too if you want and they could be powerful LEDs too if you want

I wouldn't use resistors on high power LEDs, you need constant current drivers to make it safe and reliable.

SouthernAtHeart

#3
Mar 16, 2011, 02:14 pm Last Edit: Mar 16, 2011, 02:16 pm by SouthernAtHeart Reason: 1

I wouldn't use resistors on high power LEDs, you need constant current drivers to make it safe and reliable.

???  You can't just use resistors to drop 12 volts or 5 volts down to the proper voltage for high power LED's.  'Constant current drivers?'  Is there some good reading you'd recommend to better understand this?  I'm wanting 1-4 LED's to kind of light up an area under a cabinet.  Not sure how big of LED's I need.  There's 'super bright' LED's, but I don't think they really use that much current.  Does anyone have any good info on this topic?

ps.  would something like this not work with just some resistors...
http://cgi.ebay.com/2-Super-Bright-LED-Touch-Light-Set-Under-Cabinet-Closet-/390297205315?pt=LH_DefaultDomain_0&hash=item5adf86ba43#ht_2106wt_1139

Grumpy_Mike


SouthernAtHeart

I guess I won't really need the high power LEDs.  Here's what I plan to use:
http://cgi.ebay.com/ebaymotors/LED-STRIP-30CM-DRL-DAYTIME-RUNNING-LIGHT-AUDI-BLUE-12V-/130394189542?pt=Motors_Car_Truck_Parts_Accessories&hash=item1e5c196ee6#ht_5317wt_939

...I shouldn't need anything but the RFP30N06LE MOSFET to use this since my power supply is 12 volt and it is made to connect to automotive 12 V.

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