how to limit to current to led's?
I have a diy led project.
My batteries are dying really fast, I did a litte bit a research and find out that my led are drawing alot of current from my 3 AA's
I wire my 36 led's in a parallel fashion
voltage supply 4.5v
vf = 3.4 per each led
If = 20 ma
currently Not running any resistor through the leds.
What is the best way to make the battery last longer or to limit the current that is being supply led's?
thanks in advance!!!!!