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LED Throwie Safety

Discussion in 'LEDs and Optoelectronics' started by R3BORN UK, Jan 15, 2013.

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  1. R3BORN UK


    Jan 15, 2013
    This is going to be UNBELIEVABLY basic, but I volunteer at a junior school so I need to check and double check EVERYTHING :D

    Want to make some throwies with the kids for a lunchtime project. I've found a bulk lot of 100 cheap leds, that come in red, green, blue, yellow, and white:

    Now I understand the safe voltages/amps across each colour of LED are different, with red and yellow typically sitting way below the outputted 3v from your generic cr2032. But I also know that throwies general operate fine without a resistor, and without the lithium battery exploding.

    Question is this, should I pre solder the LED's with resistors, JUST to be safe?

    Thank you for your time.
  2. CocaCola


    Apr 7, 2012
    Since they are short lived disposible toys, don't worry about the resistor... The coin cell will die long before those 'super' bright LEDs puke out due to slight over current they might get... Also the coin cell itself will puke and self limit current due to it's own internal resistance before it can provide any significant amount of current that would immediately damage the LED significantly or even noticeable...

    The short of it don't worry about resistors in this experiment, you will be fine just sliding the LEDs over the 2032 batteries...

    BTW if I can't readily locate my LED tester that has limited currents, I will use a 2032 for a quick LED test without hesitation, even on standard LEDs...
  3. R3BORN UK


    Jan 15, 2013
    I never bother myself at home, but like i said, the kids will be putting these in their bags and taking them home. So i must be 100% sure.

    Thanks for the prompt response
  4. BobK


    Jan 5, 2010
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