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Matte629	#1 10/01/2009 - 15h01 Top
Class : Apprenti Posts : 8 Registered on : 28/12/2008 Off line	If youre wondering why the top post edits all the time is becouse i don't need that answer anymore. My led's got: Forward Current IF: 20mA Forward Voltage VF: 2.0-2.2v Resistors: 150 OHM x 3 Some how, i made the leds working with 2.4 volt. Doesn't seem to light to strong or too little with batteries.Everything seemes to work. Now, IF the motherboard crashes, what made it do so? Already prepared a USB-wire. I'm talking about connecting to USB if you're wondering. Edited by Matte629 on 11/01/2009 at 21h17.
tristan68	#2 10/01/2009 - 18h39 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello matte629 When is it a risk of damaging the motherboard? If you make a mistake...... Since you ask , i presume you're not familiar with electronics. If that's the case , you shouldn't go for USB power. but that's just my opinion........ My led's got: Forward Current IF: 20mA Forward Voltage VF: 2.0-2.2v Unusual values ..... Can you tell more ? (led model if you have it) And i'm using 3 resistors with 150 ohm each. Correct value , for the given parameters. The USB voltage is 5V, right? Yes , USB voltage is 5V. Also, a subquestion: + from top - from bottom cya
Matte629	#3 10/01/2009 - 20h41 Top
Class : Apprenti Posts : 8 Registered on : 28/12/2008 Off line	tristan68 @ 10/01/2009 - 19h39 a dit: Hello matte629 When is it a risk of damaging the motherboard? If you make a mistake...... Since you ask , i presume you're not familiar with electronics. If that's the case , you shouldn't go for USB power. but that's just my opinion........ My led's got: Forward Current IF: 20mA Forward Voltage VF: 2.0-2.2v Unusual values ..... Can you tell more ? (led model if you have it) And i'm using 3 resistors with 150 ohm each. Correct value , for the given parameters. The USB voltage is 5V, right? Yes , USB voltage is 5V. Also, a subquestion: + from top - from bottom cya Yes, here is the one: http://www.upplyst.se/product_info.php?cPath=21&products_id=181&osCsid=7204032828c26c94029041862475059a (it's in swedish but the parametres are in english too) if + is from top, i've done wrong.. what's the difference of placing the resistor in front of the led and of placing it behind? Thanks for reply Edited by Matte629 on 10/01/2009 at 20h44.
tristan68	#4 10/01/2009 - 22h11 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello Matte629 Yes, here is the one: Red led ... this explains. if + is from top, i've done wrong.. what's the difference of placing the resistor in front of the led and of placing it behind? Nope + is on top and - is on bottom what you must take care of is : - led polarity (anode toward +, cathode toward - - led and resistor must be in serial - but resistor can be toward the - or toward the +. We just usually represent resistor towards the + , thats all cya
desrat	#5 11/01/2009 - 00h47 Top
Class : Apprenti Posts : 12 Registered on : 10/01/2009 Off line	tristan68 @ 10/01/2009 - 23h11 a dit: led polarity (anode toward +, cathode toward - This confuses me some places show the anode/cathode the other way around....whats all that about? Edited by desrat on 11/01/2009 at 00h48.
Matte629	#6 11/01/2009 - 08h03 Top
Class : Apprenti Posts : 8 Registered on : 28/12/2008 Off line	desrat @ 11/01/2009 - 01h47 a dit: tristan68 @ 10/01/2009 - 23h11 a dit: led polarity (anode toward +, cathode toward - This confuses me some places show the anode/cathode the other way around....whats all that about? In the freetrack manual, it is like tristan said. Anyway, thanks everyone. Will probarly connect everything today and see how it will be.
tristan68	#7 11/01/2009 - 08h31 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	@desrat : WARNING : There's an error in your pictures. The first picture says : anode toward - and cathode toward + : THIS IS FALSE The second picture seems ok A led works if it's anode is towards + and it's cathode towards - Usually, you can recognize cathode by the flat edge of the case. Don't use the big part/small part of the chip to recognize anode from cathode , as some leds use an inverted chip (ie : SFH485P) cya
Matte629	#8 11/01/2009 - 08h43 Top
Class : Apprenti Posts : 8 Registered on : 28/12/2008 Off line	I came on something.. i've alreadu put on the resistors optimized for 5 volt. I don't think i got a clear answer of what can hurt the motherboard if i do wrong by connecting via USB? If i first check with a Multimeter and connecting to another power supply and it shows right, can i also connnect to USB without danger? What do i need to know if i want to connect to USB.
Matte629	#9 11/01/2009 - 14h05 Top
Class : Apprenti Posts : 8 Registered on : 28/12/2008 Off line	I would like to get some troubleshoot here now. Made the cap like this: I'm using same leds and resistors as before. When connecting to a 1.5 battery, should it even light at all (since optimized for 5 volt)? Becouse it doesn't. When connecting to two 1.2 Volts bateeries, i'm feeling heat from the wires. Does that mean that the electricity goes around? Edited by Matte629 on 11/01/2009 at 15h21.
desrat	#10 11/01/2009 - 15h18 Top
Class : Apprenti Posts : 12 Registered on : 10/01/2009 Off line	tristan68 @ 11/01/2009 - 09h31 a dit: @desrat : WARNING : There's an error in your pictures. The first picture says : anode toward - and cathode toward + : THIS IS FALSE The second picture seems ok A led works if it's anode is towards + and it's cathode towards - Usually, you can recognize cathode by the flat edge of the case. Don't use the big part/small part of the chip to recognize anode from cathode , as some leds use an inverted chip (ie : SFH485P) cya Yeah I'm ok with it, I always thought the anode was + so it just perplexed me when I came across the first pic, but yeah mine adhere to the anode+ cathode-
Matte629	#11 11/01/2009 - 15h41 Top
Class : Apprenti Posts : 8 Registered on : 28/12/2008 Off line	Some how, i made the leds working with 2.4 volt. Doesn't seem to light to strong or too little with batteries. ok, back to the first tread then. Everything seemes to work. IF the motherboard crashes, what made it do so? Already prepared a USB-wire..

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