This is going to be UNBELIEVABLY basic, but I volunteer at a junior school so I need to check and double check EVERYTHING
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:
http://www.ebay.co.uk/itm/230827935983?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
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?
http://www.ebay.co.uk/itm/Carbon-Re...al_Components_Supplies_ET&hash=item1e623ec1c3
Thank you for your time.
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:
http://www.ebay.co.uk/itm/230827935983?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649
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?
http://www.ebay.co.uk/itm/Carbon-Re...al_Components_Supplies_ET&hash=item1e623ec1c3
Thank you for your time.