With the prices for FPGA (Field Programmable Gate Array) chips coming down all the time, FPGA development has become affordable for the electronics hobbyist. I was looking around at starter boards and saw several recommendations for the Digilent Spartan-3 Starter Board. At $99, it is one of the cheapest boards available, yet it has some pretty impressive features.
LCD clocks powered by a potato used to be sold as novelty items in many stores. I don’t know if they are still available, but that idea is a common science project. But how much current and voltage does a battery like that actually generate? I found a good article by Hans Summers called Homemade batteries that addresses this very question.