Hiops, Everyidea and all:
I just crushed the quartz rocks right on the beach using a stone on a flat rock, until the quartz looked like floor, with some small bits also.
I think that the carbon cell works a little better though. The combination of layered Carbon and Quartz also seam to work fine. After two days the led is still bright using three cells, and does not seam like its going down in brightness, by much. The weakest cell will always determine and limit the total current output when several cells are connected together. So, until I have three identical cells, I won't know what all they can really do. But 60 mA per cell is not bad, and I'm sure that can be improved on...
These cells costed me $0... I especially like that part, and they were fun to make. They can be connected in series as well as in parallel, to obtain the needed voltage and current levels, and they have low cell impedence, as well.
I just crushed the quartz rocks right on the beach using a stone on a flat rock, until the quartz looked like floor, with some small bits also.
I think that the carbon cell works a little better though. The combination of layered Carbon and Quartz also seam to work fine. After two days the led is still bright using three cells, and does not seam like its going down in brightness, by much. The weakest cell will always determine and limit the total current output when several cells are connected together. So, until I have three identical cells, I won't know what all they can really do. But 60 mA per cell is not bad, and I'm sure that can be improved on...
These cells costed me $0... I especially like that part, and they were fun to make. They can be connected in series as well as in parallel, to obtain the needed voltage and current levels, and they have low cell impedence, as well.
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