Click on the link below to check out the collection of the Design Articles, Case Studies, Product How-To articles, Teardowns, etc... related to energy scavenging that have been published on Smart Energy Designline.
Click here: http://www.eetimes.com/design/smart-energy-design/4372778/Energy-harvesting---Design-archive
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Global Thermoelectric manufactures TEGs that convert heat into electricity. Using a burner you can generate continuous DC electricity with no moving parts. Generators range in output size from 15 to 550 Watts.