10W LED Power supply - Page 1
Forum section: electronics / projects

author: ashley.hughes
author_rank: Regular Contributor
timestamp: December 08, 2011, 05:37:31 am
content: Hi,I was inspired by Kibi's Project Cree - The LED bench lighting project.And thought to my self my bench is way to dark as my rooms lighting is off to one side.So I bought some 1W LED's with there own little power supply they work great. But (Always a but) I also got a 10W LED with it's own heat sink. To see how that goes.Now it runs at 9-11V @ 1A, I was after I point in the right direction for designing up some type of power supply for it 240 to 10V and if it could run 3 of these bad boys it would be awesome. I done a small Google search and it turned up a lot of prebuilt ones, but stuff is all ways more fun if you build it your self. I have basic experience with power supplies, my LM317 based supply is AWESOME.So what would be a good base for 240V down to 10V with 1+ Amps?

author: hacklordsniper
author_rank: Frequent Contributor
timestamp: December 08, 2011, 08:29:02 am
content: Well line powered SMPS is different animal from LM317, however i reccomend you check this linkhttp://uzzors2k.4hv.org/index.php?page=miniflybacksmps

author: fmaimon
author_rank: Unknown
timestamp: December 08, 2011, 09:35:50 am
content: Messing with mains voltage is dangerous if you don't know what you are doing!You should get a power supply that gives you say 12V and use it to feed a constant current regulator, switched or not.

author: hacklordsniper
author_rank: Frequent Contributor
timestamp: December 08, 2011, 10:10:59 am
content: Quote from: fmaimon on December 08, 2011, 09:35:50 amThat is a better option but its not a way to learn

author: Balaur
author_rank: Unknown
timestamp: December 08, 2011, 10:29:12 am
content: Quote from: fmaimon on December 08, 2011, 09:35:50 amAgree on that. Better start from a standard ("brick") power supply and implement your own switching current supply. The requirements will be much more relaxed on terms of design issues, components selection, safety and so on.There are a lot of opportunities to learn that don't involve mains power.Cheers,Dan

author: fmaimon
author_rank: Unknown
timestamp: December 08, 2011, 10:59:25 am
content: Quote from: hacklordsniper on December 08, 2011, 10:10:59 amMains is not something that you should take for granted. If you want to do anything with mains by yourself, you need to read a ask a lot of questions first! It's not something that you can hack your way in to it!

author: hacklordsniper
author_rank: Frequent Contributor
timestamp: December 08, 2011, 11:03:08 am
content: Author asked, i gave him a nice example. If he really wants to build it he will, mains voltage is dangerous and deadly im sure the author knows it.People should be responsive for themself.

author: ashley.hughes
author_rank: Regular Contributor
timestamp: December 10, 2011, 07:15:29 am
content: I do know that mains, is something not to be messed with.I have used mains for an amp project before, still kicking.I will check out the link tomorrow thanks hacklordsniper. My LM317 based supply is off mains as wellMains -> Transformer -> Bridge Rectifier -> Into the LM317Thanks for the help.