led's in series

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charlie_one

Member - Posts: 18

Joined: December 14, 2005

Location: Sweden

Posted: December 15, 2005 at 10:19 AM / IP Logged

Hi All

This is probely a silly question, if ill put 3 leds ( 3,3v nom / 3,7v max) in a serie ( - to + on the next led, osv), can ill put 12 volts whit + on the first led and - to the last led ¿¿¿

Or is the only way to use a resistor for each led ¿¿

Where the asphalt ends, the Pathfinder way begins.

/New nissan 4x4 saying /

Ps sorry for my halfbad english ds

ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: December 15, 2005 at 2:53 PM / IP Logged

You could use one resistor for the string.

charlie_one

Member - Posts: 18

Joined: December 14, 2005

Location: Sweden

Posted: December 15, 2005 at 5:09 PM / IP Logged

{P}Is a {SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana; mso-fareast-font-family: 'Arial'; mso-bidi-font-family: 'Arial'; mso-ansi-language: SV; mso-fareast-language: SV; mso-bidi-language: AR-SA"}470ohm resistor enough for 3 leds, and when ill connect dem ill get all the positive connectors on the led:s to that resistor and the resistor to +12v, an the minus connectors directly to earth ¿¿{/SPAN}{/p}{P}{SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana; mso-fareast-font-family: 'Arial'; mso-bidi-font-family: 'Arial'; mso-ansi-language: SV; mso-fareast-language: SV; mso-bidi-language: AR-SA"}Or do ill connect them as in the first post (+ to-), and the resistor on + on the first led ¿¿ {/SPAN}{/p}{P}{SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Verdana; mso-fareast-font-family: 'Arial'; mso-bidi-font-family: 'Arial'; mso-ansi-language: SV; mso-fareast-language: SV; mso-bidi-language: AR-SA"}Sorry for this simple questions, but im really a novise to this kind of electrical jobs. {IMG src="https://www.the12volt.com/installbay/smileys/smiley9.gif" border="0"}{/SPAN}{/p}{div style="width:240px;border-bottom:1px solid #eeeeee;margin-top:10px;margin-bottom:0px;"}{/div}{span style="font-size:.70em;line-height:1.2em;color:#000000;"}Where the asphalt ends, the Pathfinder way begins. {BR /} {BR /}/New nissan 4x4 saying / {BR /} {BR /}Ps sorry for my halfbad english ds {/span}

Please do not copy and paste from a rich text editor like Microsoft Word. Please copy and paste from a plain text editor like Notepad.

charlie_one

Member - Posts: 18

Joined: December 14, 2005

Location: Sweden

Posted: December 15, 2005 at 5:14 PM / IP Logged

Sorry for the mess above, didnt use my head agine ! led's in series -- posted image.

470ohm resistor enough for 3 leds, and when ill connect dem ill get all the positive connectors on the led:s to that resistor and the resistor to +12v, an the minus connectors directly to earth ¿¿

Or do ill connect them as in the first post (+ to-), and the resistor on + on the first led ¿¿

Sorry for this simple questions, but im really a novise to this kind of electrical jobs. led's in series -- posted image.

Where the asphalt ends, the Pathfinder way begins.

/New nissan 4x4 saying /

Ps sorry for my halfbad english ds

cowboy21

Copper - Posts: 64

Joined: October 31, 2005

Location: Australia

Posted: December 16, 2005 at 1:21 AM / IP Logged

it doesn't matter what side the resistors go on, + or - simple =D

modest yet effective... ECLIPSE 12", Venom 8"x2, Focal 5 1/2" comp.,Response amps x2 (580WRMS total @ 4Ohms), Pioneer TFT + DVD, good for 148.7dB

charlie_one

Member - Posts: 18

Joined: December 14, 2005

Location: Sweden

Posted: December 19, 2005 at 2:20 AM / IP Logged

Well now ill got it to work, did turn out great, thanks for the help !!!!!!!!!!!

Where the asphalt ends, the Pathfinder way begins.

/New nissan 4x4 saying /

Ps sorry for my halfbad english ds

boyzWidToys

Member - Posts: 26

Joined: October 16, 2004

Location: Canada

Posted: December 22, 2005 at 3:14 PM / IP Logged

i ve actually been experimenting with this. The problem is a car's electrical is NOT a constant 12v.

it varys between 12 and 18 from what i heard.

i attached 3 red led's in series making (assuming 3.3 v each) 9.9 volts.. and connected that across the 12 volts.

it worked fine.

i don't know about life estimate.. or how it would affect. i'm still playing around.

charlie_one

Member - Posts: 18

Joined: December 14, 2005

Location: Sweden

Posted: December 23, 2005 at 3:25 AM / IP Logged

so its possible to put 4 in a serie and not use any resistor at all ¿

When a car is running its generate just under 14 volts, its only 12 volt when the alternator isnt "engaged", that much ill now.

Where the asphalt ends, the Pathfinder way begins.

/New nissan 4x4 saying /

Ps sorry for my halfbad english ds

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led's in series

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