DIY: Dashboard light LED conversion - Page 2 - Fuelly Forums

Click here to see important news regarding the aCar App

Thread Tools Display Modes
Old 08-09-2007, 09:32 AM   #11
Registered Member
Rick Rae's Avatar
Join Date: Jun 2007
Posts: 240
Country: United States
Originally Posted by Chromedome2000 View Post
I was wondering what was wrong (if anything) with wiring it up as in my illustration.
There's nothing wrong with the series aspect of it, as long as either A) all the LEDs are fairly well matched (i.e. have about the same luminous efficiency) or B) you don't care if some of the LEDs are brighter than others.

The parallel part is dicey, though. LEDs are current-operated devices, and one LED/string of LEDs can end up hogging most of the current, resulting in the others being considerably less bright or not visible at all. Problems with LEDs in parallel are much more likely than with them in series.

It hurts nothing to try, though. If you run into problems, you can likely juggle the LEDs around until you get them fairly well balanced. (There might still be differing characteristics across the temperature range, but you won't know until you try!)

Thing is, high quality resistors aren't needed for LED current limiters, and when you can get regular ones for literally pennies each, avoiding them doesn't buy much versus the potential problems. Unless one is trying to fit a project into a tiny space or designing a consumer product where even a few extra cents can screw up the profit margin, it's usually wise to give each LED (or series string of LEDs) its own resistor.

Which is why, as you noted, you see individual resistors so often.

Hope that helps,

Rick Rae is offline   Reply With Quote

Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
MPG versus air temperature and Altitude MensaMike General Fuel Topics 6 06-21-2011 05:16 AM
newbie civic owner EH3 Introduce Yourself - New member Welcome 21 10-17-2006 04:26 PM
compressed air car MetroMPG Electric and Solar powered 7 04-09-2006 10:59 PM
Any ideas how to install this? Compaq888 General Maintenance and Repair 0 12-21-2005 12:46 PM

» Fuelly iOS Apps
Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 12:51 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.