Energy harvesting IC...

[ScaleRobotics]

Their site is a bit hard to navigate, but here is one that is referenced
http://www.advancedcerametrics.com/pages/product_line

And here is the other one (but it is double the price)
http://www.piezo.com/prodexg1brass.html#priceinfo

I have not looked at the data sheet. Mostly because of sticker shock. Let us know what you find out.

Walter

EDIT:

Some more info here: http://www.piezo.com/tech2intropiezo...ntroGenerators

[Bruce]

Thanks Walter. Looks like I won't be using these any time soon. You're definitely not going to replace any of these high-end piezos with the little piezo buzzer elements.

I'll stick with a super cap with a small solar charge panel until they make the technology a LOT cheaper. I was really interested until I saw the pricing.