Reply
 
Thread Tools Search this Thread
 
Old 10 January 2013, 14:49   #21
Member
 
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 896
Thanks, here also usefull information:

LED driving and controlling methods

Yes, they get hot very quickly without heat/termal sink.


This seams to be a versaltile pice, voltage in/out and current is adjustable, and price delivered
about 3 euros. But again no idea about the quality....Instructions in totally not understandable chinglish..will order a few to test.
Attached Thumbnails
Click image for larger version

Name:	led driver.jpg
Views:	67
Size:	91.6 KB
ID:	75377  
__________________

__________________
fun on a boat is inversely proportional to size...sort of anyway
C-NUMB is offline   Reply With Quote
Old 11 January 2013, 08:51   #22
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
Quote:
Originally Posted by nik View Post
If you have a soldering iron, this seems a cheap solution.

Super simple high power LED driver

Thats the best simple way to do it, a simple current sink from a 317 chip.
a resistor will work but as battery voltages varies from 10.8 to 15 volts (worst case) you wont have a very stable light output.
just look at the Vf/Current for an LED, they are more or less a voltage reference, therefor must be driven by a constant current. a resistor is a very bad way of doing this . (unless you have a very big resistor and high voltage battery!!
__________________

__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 12:13.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.