> > > > The bad news is that memory cards are allowed to draw quite a bit more > power than I thought. One is specified as using up to 75 mA during for > a write, which can take up to 250 ms. At 3.3 V, that's about 250 mW, > about twice the best-case power output of a CR2032. > > Real-life consumption of a card may be well below this, though. > > > 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
As I'm not very handy with electronics calculations, I try my trial-error system to calculate capacitors for my homemade circuits combined with a web with capacitor calculator, but for this case (if I haven't put the wrong numbers), it seems that you would need a ยก50mf one! [image: Inline image 1]
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