| 6:36 PM
No electricity, no tension..charge your cellphone this way, hoax or real?
So long as you had enough lemons in series and parallel.
See the actual reaction is not the lemon juice. The lemon juice acts as an electrolytic solution for the two metal electrodes. Typically nickel and copper. If you used better metals like magnesium and copper you would be able to get a high voltage potential and require fewer lemons. I did a project a few years back where we wired lemons together to power a toy car. Its not about how many lemons its about how many electrodes you have. In fact if you took an ice tray and filled it with electrode pairs in parallel and series making sure the electrolytic solution (lemon juice or any other acid) was seperated you would be able to generate a decently high voltage and current for a short while.
I've tested my old LG phone it required 5V 100mA but it would marginally charge. It was sporadic and it required at least 125mA to charge correctly (bad supply). I had designed a 100mA boost regulator in this instructable but it was not sufficient. Check it out if you would like. (I'm also entering the laser cutter contest so feel free to vote)
I also tested a joule thief. The one I designed had a switching frequency of 250kHz. So it does not really boost any power. The average power over time remaining the same. What it really did was in a way peak the power at a fast enough rate to allow your eye to imagine the LED is fully on when in reality it is blinking.
There is a really detailed explanation to how the joule thief works at this site
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