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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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Old 10-09-2011, 09:01 PM
schfiftyfivefive schfiftyfivefive is offline
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Default Trunk Lighting for Showcar, Current regulator w/

So I finished my trunk display for my car, custom subs boxes and suede lining, pretty pleased. I'm in the midst of doing the lighting now, I've wired a harness straight from the battery with a relay triggered from the ignition.

I ordered a few Osram 1 amp 1.5 Vf LED chips, I plan on having about 4 of them to light up the entire trunk (they're very bright)

I've never done much for LEDs before, but I understand that I'll need a current regulator to control the brightness. If I have 4 in series, will the last 7.5v (13.5v-(4ledsx1.5Vf)) be given off as heat in the current regulator, or will I need a voltage regulator as well?
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Old 10-09-2011, 09:10 PM
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Depends. A linear regulator burns off the excess, a switching regulator only loses 10 to 20% as heat. You can look up "Buck Puck" or examine romanblack.com for a switch mode constant current LED driver.
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Old 10-09-2011, 09:59 PM
circa27 circa27 is offline
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Thanks, I was researching the buck pucks, and I see they have 7 pins. I also read that the red/black are obviously power/ground, the blue/white are LED +/-, and the yellow/grey are control pins for pwm or strobe sources or w/e you might be using.

Thats still only 6 pins, and on this picture I see no color coding..?

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Old 10-10-2011, 12:40 AM
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@schfiftyfivefive

Welcome to the AAC forums.

This thread is a violation of the AAC forum rules, Chapter 6, as seen here:
http://www.allaboutcircuits.com/l_tos.html
Namely, automotive modifications of any kind are strictly forbidden.
Therefore, this thread will be closed.

Please understand the reasons behind this action and bear no grudge.
Feel free to tread on the rest of the forums.
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