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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > equivalent resistance

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WarriorWulf	#1 23/07/2016 - 21h15 Top
Class : Apprenti Posts : 4 Registered on : 23/07/2016 Off line	Hi all, I had a question about the wiring of the leds and resistors, lets say the calculator tells me to use three resistors for three leds and instead I want to place only one resistor with the formula to calculate the equivalent resistance. If we use 1/R = 1/R1 + 1/R2 + 1/R3, is it then not possible to use only one? Is there a special reason to do it with three? Can I build it in serial? Edited by WarriorWulf on 23/07/2016 at 21h24.
Stormrider	#2 23/07/2016 - 21h51 Top
Class : Légende du Forum Posts : 466 Registered on : 02/01/2013 Off line	with three resistors you also share the dissipated power(heat) over the three of them.And what if one of your leds has a small variation in internal resistance. If you want to use 80mA as forward current for each led, this means one resistor has to deal with 0,24A I personal think the best model is made with usb power(5Volt) and paralel circuit.That ptc is not needed. You can use a powerbank which are used for charching smartphones as a wireless powersource.
WarriorWulf	#3 23/07/2016 - 22h01 Top
Class : Apprenti Posts : 4 Registered on : 23/07/2016 Off line	Thanks for the reply dude its just what i wanted to know.
Stormrider	#4 23/07/2016 - 22h17 Top
Class : Légende du Forum Posts : 466 Registered on : 02/01/2013 Off line	Do you know that freetrack is not the only ir-tracking software?It is the oldest and no more updated.Even though it can work on win7/8/10 it still can give you some problems.The others can be found here and are still updated: opentrack https://github.com/opentrack/opentrack/releases For Facetracknoir the developer askes a small fee,a very small compensations for tons of pleasure. http://www.facetracknoir.nl/ Edited by Stormrider on 23/07/2016 at 22h21.
WarriorWulf	#5 23/07/2016 - 22h23 Top
Class : Apprenti Posts : 4 Registered on : 23/07/2016 Off line	I did not, thank you for the info!
Stormrider	#6 23/07/2016 - 22h38 Top
Class : Légende du Forum Posts : 466 Registered on : 02/01/2013 Off line	and something instead of ir-tracking. http://www.edtracker.co.uk/ You can built it yourself or purchase it ready to use.

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > equivalent resistance

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