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Monday, November 5, 2012

Ultracapacitor Supercapacitor Tools

Popular Science DIY supercap screwdriver (and useful links therein)
http://www.popsci.com/diy/article/2008-02/make-instant-charge-screwdriver

Also useful links herein... see tools, portable use section
http://en.wikipedia.org/wiki/Electric_double-layer_capacitor

Coleman FlashCell - came and went...
http://www.popularmechanics.com/technology/gadgets/4223118

Supercapacitor screwdriver comes up as a half baked idea...
http://www.halfbakery.com/idea/Supercapacitor_20Cordless_20Screwdriver

There are problems:
  • Low voltages
  • Series cell balancing issues
  • Brief (millisecond) blips in charging voltage can do damage
  • Linear capacity means energy in under 1V range goes forever unused/wasted
  • Fast self discharge

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