FreeTrack Forum
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Class : Apprenti Off line |
Hi guys, this is my first post, I was trying some things before begining with the final design of the clip and the leds, and suddenly smoke apears.
I was checking the cables, leds and a push button and they were not burning. What was burning is the case that contains the two batteries, it appears that they are generating too much heat. I think you can use any battery for this project, but apparently that's not the case. The specifications of the battery are this: Sony Cycle Energy rechargeable NH-AA HR15/51 1.2V AA HR6 MIGNON typ. 2000mAh I was checking other batteries, and I found a rechargeable battery with 700mAh, so I assume that should be the right choice. Anyway I ask for your advice guys. Thanks in advance. (Actually my digital camera use this sony battery, so I hope it don't get fried for the battery)  |
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Class : Apprenti Off line |
"mAh" is an abbreviation for milliampere-hour which is actually a unit of electrical charge (Wikipedia link). In other words, it's how long the battery will last before needing to be recharged. Higher numbers are actually better!
More important numbers are things like voltage, the amount of current drawn in your system, etc. I suspect that maybe your test setup is allowing for too much current to be drawn from the battery. Make sure some resistors are included even in your test setups and watch for short circuits. Maybe double-check all your numbers in the LED Setup Wizard, including your LED values and your resistor colour codes. Good luck!  |
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Class : Apprenti Off line |
Thanks for the answer guys, honestly I was not using resistors because I was just making a quick test with a push button. Right now I will try the same test without the pushbutton, mainly to see if the led is overheating.
Maybe the quality of the battery case is not good. Thanks for the replies  |
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Class : Apprenti Off line |
Aha, I think that's what the problem is!
You need to have resistors even when you're testing. Without any resistors you'll get a lot of current flowing through your setup which can permanently damage your batteries. If I remember my high-school physics properly, what's happening is that there is nothing in your setup to dissipate the current provided from the batteries into heat or work. Thus the battery is the only place where this work is performed via the ionization and deionization of the atoms inside the battery itself. Because this process is under so much stress so quickly, the terminals inside the battery become coated very quickly and thickly with the de/ionized atoms that it can't be reversed, meaning it becomes permanent and greatly diminishes how much charge it will hold. In summary, make sure you have resistors or something in your setup acting as a resistor (like a light bulb). Otherwise your battery pack might get damaged permanently. Good luck! |
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Class : Apprenti Off line |
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Class : Apprenti Off line |
Hi karin, looks like you remember very well you physics lessons
, I'm right now in the office, and using my free time to test the led, and no smoke appear again, it's been over 5 minutes since i connect the led to battery and no smoke, then I connect a second led and the same, no smoke.Looks like the problem could be the push button, perhaps. Well I'm not an expert in electronics, but it's the only thing I can think, right now. What do you think? This is the push button or to be more precise, switch I used yesterday. http://www.sterenusa.com/catalog/products_desc.asp?fam=8&sfam=288&item=1825&mv=450-010BK&cuenta=2&posicion=1 The result of the test it's that there is no smoke, but the leds are just a little hot, but not extremely hot. Is that normal, could they operate in that way without resistors or this is were resistors must be appear into scene? Cheers |
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