I will be using 56 white leds. Here are the specs.

Source voltage I would like to have it at 12 volts.....

diode forward voltage

diode forward current (mA)

number of LEDs in your array

3 x 19 array uses 57 LEDs exactly

- each 68 ohm resistor dissipates 61.2 mW
- together, all resistors dissipate 1162.8 mW
- together, the diodes dissipate 5814 mW
- total power dissipated by the array is 6976.8 mW
- the array draws current of 570 mA from the source

Is it possible to use transistors to achieve 12 volts from 2 AA rechargeable batteries which together equal 2.4 volts or is it better to use a 9 volt battery" rechargeable 9 volt would be 8.4 volts.

I need to keep the battery source small to fit in the enclosure. I am not sure how long the batteries will last although i have seen lights using only 2 aa's powering similiar lights.

Any help designing a schematic with the pwm and any other info would be greatly appreciated.

I have some basic knowledge of electronics but I am struggling with the power source.

Thanks so much.