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PCD Board light

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kaugustino:
I want to build a PCB board flashlight. Using a bunch LEDs. Something like one of the Led 3 or 4 led type push lights. With capacity to be either ran on batteries or usb. I need some advice to get started. i would just get built from one of the online PCB sites. I have limited electrical experience. Mostly basic circuits stuff
 
On batteries i would like to use a lot of batteries (3-4 AA batteries). Basically something i could use for a while without changing them. Something bright enough i could use as a nightlight. With a rocker style on/off switch. Or something big/easy to use. I have a basic design idea. at this point board size/shape does not matter. I'm not considering to sell them. Just something custom for myself. Any designs i will let anyone use.

kaugustino:
So i want to build something like a LED Puck light. Those 3 led lights that you just push on the top to light it up. But i want to change that out to a rocker style on/off switch (Ease of use) But instead of using just 2-3 AA batteries i would like to add maybe double the batteries (or run it off an pocket usb charger) and more leds
Is their a basic design i can use as a template to start?

kaugustino:
My crappy drawing attempt
LEDs could also be circular. Does not matter.

bob91343:
There are two basic approaches.  The first, and simplest, uses resistors or constant current devices to limit LED current.  Not too efficient but widely used.

The second uses a complex switching circuit that accomplishes the same thing but wastes much less energy.  This translates into longer battery life.

The best scheme treats each LED separately.  You can also put them in series but making the current constant is a bit more of a challenge due to the limited overhead voltage from AA cells.

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