I saw this on the www version of EDN mag -- a JFET based DC-DC converter which will operate as low as 300 mV -- you could power it off a solar cell or thermopile:
http://www.edn.com/contents/images/6335301.pdf
output current is limited to 2 milliamps -- enough for some fleapower applications.
http://www.edn.com/contents/images/6335301.pdf
output current is limited to 2 milliamps -- enough for some fleapower applications.
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