Another quick search and somebody suffered your pain in 2011 :P http://interactive-matter.eu /blog/2009/08/29/driving-circuits-from-a-cr2032-lithium-coin-cell#comment-5748
I'm a fan of AAA power, since they're cheap and rechargeable options, but what about other options: - Parallel CR2032 - Rechargeable coin cell http://www.digikey .com/product-detail/en/ML2430-CJ1/SY615-ND/3662229 Changing the microsd storage by flash storage don't improve the situation, because they also typically eat 10-15ma when writing :S On Thu, Apr 9, 2015 at 10:12 AM, Werner Almesberger <[email protected]> wrote: > Felix wrote: > > I was curious about that and find some data on stackoverflow: > > > http://electronics.stackexchange.com/questions/37173/low-power-micro-sd-card-storage/123386#123386 > > Ah, nice ! Pity he didn't have a better meter that would let him > monitor also the short peaks. > > > it seems that you would need a ยก50mf one! > > Yeah, I ended up with this sort of monsters, too :-) > > Now, there would be fairly small and not too expensive supercaps > in that range. However, they have an even worse ESR (Equivalent > Series Resistance) than the coin cell: about 15-20 Ohm for the > cell, about 100 Ohm for a compact supercap, so they couldn't > deliver nearly enough current. > > However, I also found supercaps with a low ESR. But they're quite > large and pretty expensive. Here is a 50 mF model with a stunning > 100 mOhm: > http://www.digikey.com/product-detail/en/BZ013B503ZSB/478-3521-ND/1014116 > > That's when I decided that this is probably not where I'll find a > solution ... > > - Werner > > _______________________________________________ > Qi Hardware Discussion List > Mail to list (members only): [email protected] > Subscribe or Unsubscribe: > http://lists.en.qi-hardware.com/mailman/listinfo/discussion > -- Felix
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