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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > building the 4 LED Project but have a question.

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metteigel #1 25/08/2011 - 13h17

Class : Apprenti
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Registered on : 25/08/2011

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Good Day and a very nice "Hallo!" from Germany!
I want to build this Prroject: 4LED

I bought this Items:
4x Osram SFH485P IR LED´s
1x 33 Ohm Resistor
1x 9V Battery
1x Battery Clip
and this Headset:
http://www.amazon.de/gp/product/B001FBOELE/ref=oss_product


Now the Master Qusetion is!:
How should i attach the LED on the Headset and in which Position??


Hope you can help me.
dewey1 #2 25/08/2011 - 19h14

Class : Habitué
Posts : 191
Registered on : 25/06/2010

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Just build a series 3 LED version. Just as good and simpler to build.
A 9 Volt battery will not last very long.
You will damage the LED's with a 33 ohm and 9 Volt power source.
If you use 9 Volt then you need about 100 Ohm.

With a 33 Ohm a 6 Volt power source will work.
note; each LED drops 1.5 Volt. So 3 LED's in series drops 4.5 Volts.
6-4.5=1.5
1.5/33=.045 or 45mA of current.

No need to run at greater than 50 to 75 mA.
This is 50% to 75% of maximum.
Operating at any higher justs reduces LED life expectancy and uses up battery life!
Edited by dewey1 on 25/08/2011 at 19h15.
Steph #3 03/09/2011 - 13h48

Class : Moderator
Posts : 656
Registered on : 16/11/2007

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Hallo metteigel,

wie schon mein Vorgänger sagte: die vier LED Version ist ein veraltetes Modell und durch das Dreipunktmodell ersetzt.
Zu den verschiedenen Versionen und Anordnungen der LEDs kannst du auch hier mal schauen, dort habe ich meine Bastelarbeiten aufgeführt. ;)

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