LED how to connect the lamp band, 12 volt battery is not damaged
LED lights power supply for 3V, four series as a group, just for 12V, pay attention to positive and negative pole, do not take the wrong.
Using Ohm's law count add much resistance or special transformer.
Direct contact will burn. The three should be connected in series, with 150 ohm resistors in front (power not less than 0.06 watts). Note the positive and negative poles, and the gap is negative.
