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Topic: People hate resistors for their LEDs (Read 4 times) previous topic - next topic

CrossRoads

You're right, I hadn't opened the links.
Saw /download on the first one, assumed it was a lead in to download fritzing.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

trendski

Hi Guys,

hope this isn't a proverbial grandma-egg-sucking  moment, but you can get leds suitable for 5v use with built in resistors
UK: http://www.rapidonline.com/Electronic-Components/5mm-Red-LED-5V-60-150mcd-Diffused-55-2670/?source=googleps&utm_source=googleps

I think there are 12v ones too.


I don't like fritzing either, I prefer circuit diagrams every time.
Craig Turner, blog: http://gampageek.blogspot.co.uk/ It helps with my learning if I write things down, esp. for others to follow (constructive comments welcomed to improve)

focalist

#12
Jan 17, 2013, 04:10 pm Last Edit: Jan 17, 2013, 10:48 pm by focalist Reason: 1
I will say that the high power LED's that are sold with the current limiting already on the heatsink are awfully nice to use, even if they are a bit more expensive.  I've paid as much as two dollars a watt, but usually they end up being around half that, at a buck a watt, give or take, for whites in the 2watt range.  Feed them anything from 3.2 to 6v, they self limit at 500ma or thereabout.  Here's a link:

EDIT: Got diverted while getting the link, hehehe:

http://www.ebay.com/itm/10x-2-3W-LED-3-2-6V-500mA-Warm-White-for-Camping-Light-DIY-/180857225621?pt=Lamps_US&hash=item2a1bee4195

Now, I will say that it does require extra heat sinking in actual operation- but running a couple in series from 12v works great.  I suppose running three ought to be fine at 12v.  Its a lot of light for cheap money... The link has them at under a buck each for ten.  I am not connected to it in any way other than saying I've bought them and though they seem a little dimmer than expected given the power draw, but not so much that you'd actually care much...  I use an NPN transistor to switch the ground side to provide PWM.  



They are awfully convenient to use, when you don't want to diddle around with constant current sources...
When the testing is complete there will be... cake.

CrossRoads

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

CrossRoads

There are 12V LEDs with resistors for sure, with mounting hardware even.
Pricey for experimenting, great for final installations.
Some examples
http://www.superbrightleds.com/cat/led-wired-bolts/
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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