the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

led, surface mount resistors.


Post ReplyPost New Topic
< Prev Topic Next Topic >
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 27, 2010 at 12:02 PM / IP Logged  
Ah, second picture is a bust again: Here it is. My apologies again.
led, surface mount resistors. - Page 4 -- posted image.
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 27, 2010 at 12:10 PM / IP Logged  
One last time, tinypic messing with me...
led, surface mount resistors. - Page 4 -- posted image.
If it does not work, I suppose take my word for the 5v reference then.
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 27, 2010 at 12:12 PM / IP Logged  
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: January 27, 2010 at 8:07 PM / IP Logged  
Tee hee! I too hate being unable to edit else delete posts, but it's not my server space. And readers just have to read ahead in anticipation of corrections & addendums.
The last to https://i47.tinypic.com/2lu9wth.jpg has also been deleted.
But I have had no problems uploading pics here provided the filename is not long (say 10 characters).
In fact that's one thing I REALLY like about the 12volt - it hosts my images - I do NOT have to link to images stored elsewhere.
Interesting that for a LED that would nominally have a 150R resistor, it still glows at 5,000R (compare that to a 2W-3W bulb with its equivalent 15R to 500R range).
That shows how sensitive LEDs can be.
It also demonstrates what a pain they can be in circuits with leakage, or why they are unsuitable as charging-lamps for alternators.
As to needing resistors for the LEDs - they should be needed if the supply exceeds their voltage (say 2V or 3.4V etc) unless each LED is current limited (to 20mA etc).
But it may be possible to limit their voltage.
EG - if 5V supply, want 3.4V max: 5-3.4 = 1.6V.
Diodes have a fwd V drop of 0.6 to 0.7V.
2 diodes might hence drop 1.2-1.4V (hence LEDs get max 3.6-3.8V - a bit high?)
3 diodes 1.8-2.1 => LEDs 2.9-3.2V - maybe ok?
Just the 2 or 3 diodes in series with the supply (ie, from the dimmer pot etc). The diodes need to be rated for the full current (number of LEDs x 20mA etc, hence a 1A IN4004 etc should handle 50x20mA LEDs).
Not that I looked at the circuitry too well, and I assume you are correct about the 5V lamp supply (which seems strange unless they use 5V bulbs - sure they ain't 12V - maybe a grounded dimmer?).
BTW - I assume the blue LEDs are not needed for colour discrimination or as a point source?
It was something I meant to say much earlier....
If colour discrimination is required, then "the standards" say it must "subtend an angle of 2 degrees at the eye". In other words, if blue and too small, we can't tell it's blue. Or, we tend to be blue insensitive - blue need much higher power than greens or reds.     
Blue can also be stressful for some - eg, cars with blue LEDs (windscreen washers etc).
And blue with red makes for a 3-D image for the 95% of people with misaligned retinas etc (ie, most people have "faulty" eyes!) - or am I confusing the fault with those 3-D printed pictures.... yes - I am - blue bends different to red - hence the 3-D effect through glasses. The 3D effect through focussing works for the ~95% with misaligned eyes...
Alas my eyes are also misaligned, and MadCow is still apparent....
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 27, 2010 at 9:20 PM / IP Logged  
Everywhere I look says the illumination lamps receive a 5v reference and is tied into the pot/dimmer on the dash.
Let me post some link to some pdf and maybe you can take a look at them for me:
UART.pdf
IP & Console.pdf
IC Illumination Lamps.pdf
HVAC SW Radio IC.pdf
DIC Schematics.pdf
Dimmer Control.pdf
In any case I will pull the dimmer bezel and measure what one of those twist-lock style bulbs are receiving voltage wise. just let me know if you gather the same thing form the diagrams that I did. thank you!
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 27, 2010 at 9:24 PM / IP Logged  
Second pdf did not link correctly.
ICIlluminationLamps.pdf
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 27, 2010 at 9:45 PM / IP Logged  
One last try...
IPConsole.pdf
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: January 27, 2010 at 9:47 PM / IP Logged  
Grrrr! How I ever told you how much I hate you? LOL!
Other than that, I'm merely saying that I've downloaded the pdfs but won't look till later.
Damned reality calls.....
Cheers.
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 27, 2010 at 10:05 PM / IP Logged  
Haha I'm not forcing you to help, but I do appreciate it man! Not too many knowledgeable folks over at the Aurora forum with this type of stuff.
Take your time. I have plenty of time to figure this out. I won't receive the rest of my items for another ten or so days. Still like to a set game plan though!
sallc5 
Member - Posts: 45
Member spacespace
Joined: November 27, 2009
Location: West Virginia, United States
Posted: January 28, 2010 at 1:32 PM / IP Logged  
I probed out one of the twist-lock filament bulbs. Contrary to my belief it was anywhere from 5v on dim to almost 11v at max. Maybe I am missing something in the diagrams.
Page of 6

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Wednesday, December 7, 2022 • Copyright © 1999-2022 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer