I'm working on a project using an arduino Yun and there no regulator on it. So I started looking for battery, regulators, step-down/step-up regulator, etc... and now I just don't know anymore.
Here's my two founds after excluding the L7805 from my choices because of the 2V step-down thing.
StepUp/Down 5V regulator: looks pretty cool
Battery 3.7V at 2000mAh
What do you guys think of that combo?
Also, a technical question. I always though that the higher the mAh the longer the battery will last before charge (obviously depending on what's sucking on it) but that feels a bit naive. I think I read during my search that higher voltage regulated to lower voltage will last longer than low voltage regulated to higher voltage. Even if the latter has a higher mah.
So I'm confused....and the analogy of the water only took me so far in understanding electricity.
I hope someone can help me pick the right one.
ps: The arduino Yun seems to need around 250mah, a photodiode and IR led, I might also have a 2 or 3 leds, and maybe four IV-9 numitron, which need something like 3.5V at 20mah apparently. So a total around 350mah maybe, hope that helps.