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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Hello, question for 3 point LED

RSS > Hello, question for 3 point LED, For my headset

Neil_B	#1 07/08/2007 - 23h27 Top
Class : Apprenti Posts : 4 Registered on : 07/08/2007 Off line	I have a headset, it is like this: I tried using LED Guide but it is kind of confusing for me! Please, can someone help me to pick 3 LEDs and 3 resistors from American website (www.radioshack.com or any other) ?? They will be powered by this: I already have copper wire and soldering tools so that is ok.
tristan68	#2 08/08/2007 - 00h29 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello Neil. I've taken a look at radioshack's website, and didn't find a matching led. They propose one IR led there, but it's only a narrow angle led (definitely doesn't fit for our application, we need a wide angle led). What you need to find is a wide angle infrared led (usually a Osram or Siemens SFH485P or something equivalent) Then you should use the Led assembly wizard, there's a link on Freetrack Online main page. The wizard will provide a small schematic, and resistor values. If you're still confused, feel free to post here again. We'll answer ASAP.
Neil_B	#3 08/08/2007 - 02h16 Top
Class : Apprenti Posts : 4 Registered on : 07/08/2007 Off line	What about this http://www.besthongkong.com/product_info.php?products_id=105&osCsid=72891a09f03457302760ce5e4e235d37 If it would work then please recommend me resistor Edited by Neil_B on 08/08/2007 at 02h20.
tristan68	#4 08/08/2007 - 10h58 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello Neil. Yes those leds should work. 60 degrees angle isn't the best you can find , but its already good (at 0.5 radiation strength). FIY, your should really try to use the Led Wizard, located in the website frontpage ( its your friend <g> ). resistor values for 3 of those leds (FV=1.2v / IF=20mA) , a 9V battery and a serial type assembly (look at the wizards schematics) are : 270 ohms resistor 5% 0.25w (you only need 1 resistor with a serial type assembly). btw : Do you live in HK ??? If you live in US or Canada, i'm sure you can find a shop closer to your location.... cya.
Neil_B	#5 08/08/2007 - 12h15 Top
Class : Apprenti Posts : 4 Registered on : 07/08/2007 Off line	Hello No sir I live in USA I'm sure I can find closer shop but i donot want to go through the hassle Besides only about $3.57 for 3 IR leds (shipping included) This resistor work ?? http://www.radioshack.com/product/index.jsp?productId=2062318&cp=&sr=1&origkw=270+ohm&kw=270+ohm&parentPage=search Edited by Neil_B on 08/08/2007 at 12h20.
tristan68	#6 08/08/2007 - 13h36 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello neil Sure , this resistor works perfectly for the given settings. It's a bit overkill for the power rating (0.5W) but that doesn't matter. go for it ! PS : You should still look if you can order at FARNELL. They have a great choice of electronics parts, and there's normally no prob to ship to your place. btw , they have the SFH485P IR led, mucho better cya
Kestrel	#7 08/08/2007 - 15h39 Top
Class : Webmaster (admin) Posts : 780 Registered on : 13/07/2007 Off line	I'm sure I can find closer shop but i donot want to go through the hassle Besides only about $3.57 for 3 IR leds (shipping included) If you're going to 'ship' you might as well get SFH485P leds. It's no more hassle. Support FreeTrack

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Hello, question for 3 point LED

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