LEDs for vehicle? - Page 2 - Electronic Circuits Projects Diagrams Free

synergy · 19th August 2008, 03:17 PM

Please take a look of my plans, please comment if there is any problem with it.

Cheers!

Boomslang · 19th August 2008, 07:38 PM

I dont see a problem with it. You might be able to go for lower value resistors if you want them brighter (depending on the max specs of your LED's).

rezer · 20th August 2008, 01:29 AM

No problems.

synergy · 20th August 2008, 08:16 AM

The problem now is that I do not know the forward voltage and current of the LEDs, I manage to found them in the attic and so decided to do something to my ride. I tried testing 1 of them with a 560ohms resistor on a 9V battery, initially able to light up properly and bright enough, but after awhile, the LEDs just blown off.

Cheers!

Mikebits · 20th August 2008, 09:06 AM

Quote:

Originally Posted by synergy

The problem now is that I do not know the forward voltage and current of the LEDs, I manage to found them in the attic and so decided to do something to my ride. I tried testing 1 of them with a 560ohms resistor on a 9V battery, initially able to light up properly and bright enough, but after awhile, the LEDs just blown off.

Cheers!

Maybe the Battery croaked?

AllVol · 20th August 2008, 09:13 AM

Quote:

Originally Posted by synergy

I tried testing 1 of them with a 560ohms resistor on a 9V battery, initially able to light up properly and bright enough, but after awhile, the LEDs just blown off.

Cheers!

With that combination you probably were not drawing more than 10 to 12 uA of current, which would not blow the LED. Are you sure of the resistor's value?

Hero999 · 21st August 2008, 11:58 AM

10-12µA?

Don't you mean mA?

I calculate between 4mA to 13mA depending on the voltage drop of the LED and how fresh the battery is.

niq_ro · 22nd August 2008, 10:25 AM

for cars, you must calculate 2 cases, minim voltage (12,6V) and maximum voltage (14,5V), curent max. 20mA (minim recomandated is 7mA) and tension at LED's depend by..colour
- red: 2V
- yellow/orange: 2,2V
- green: 3,3V
- white/blue: 3,5

some example with group of LEDs for use at cars can see at end of http://www.niqro.3x.ro/LED/LED.htm (rosu=red, galben=yellow, portocaliu=orange, verde=green, alb=white, albastru=blue)

Hero999 · 23rd August 2008, 01:31 PM

Quote:

Originally Posted by niq_ro

- green: 3,3V

Be careful with green, yellowish green tends to be a slightly lower voltage than bluish green or pure green.

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19th August 2008, 07:38 PM	(permalink)
Boomslang	I dont see a problem with it. You might be able to go for lower value resistors if you want them brighter (depending on the max specs of your LED's). __________________ How To Ask Questions The Smart Way

20th August 2008, 01:29 AM	(permalink)
rezer	No problems. __________________ "Remember, you're special.....just like everyone else."

20th August 2008, 08:16 AM	(permalink)
synergy	The problem now is that I do not know the forward voltage and current of the LEDs, I manage to found them in the attic and so decided to do something to my ride. I tried testing 1 of them with a 560ohms resistor on a 9V battery, initially able to light up properly and bright enough, but after awhile, the LEDs just blown off. Cheers!

21st August 2008, 11:58 AM	(permalink)
Hero999	10-12µA? Don't you mean mA? I calculate between 4mA to 13mA depending on the voltage drop of the LED and how fresh the battery is. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

22nd August 2008, 10:25 AM	(permalink)
niq_ro	for cars, you must calculate 2 cases, minim voltage (12,6V) and maximum voltage (14,5V), curent max. 20mA (minim recomandated is 7mA) and tension at LED's depend by..colour - red: 2V - yellow/orange: 2,2V - green: 3,3V - white/blue: 3,5 some example with group of LEDs for use at cars can see at end of http://www.niqro.3x.ro/LED/LED.htm (rosu=red, galben=yellow, portocaliu=orange, verde=green, alb=white, albastru=blue) __________________ see http://www.tehnic.go.ro & http://www.niq.go.ro