tag:blogger.com,1999:blog-9071048343455395511.post4205086962584213263..comments2024-03-24T22:03:31.205+00:00Comments on Roger G3XBM's (Mainly) Amateur Radio Blog: Micropower generation/power harvestingRoger G3XBMhttp://www.blogger.com/profile/13673890140751539870noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-9071048343455395511.post-90056522235667649692011-12-07T17:46:05.741+00:002011-12-07T17:46:05.741+00:00Fascinating Peter. Do you have any schematics?
7...Fascinating Peter. Do you have any schematics? <br /><br />73s Roger G3XBMRoger G3XBMhttps://www.blogger.com/profile/13673890140751539870noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-77738228023114257352011-12-07T17:39:41.285+00:002011-12-07T17:39:41.285+00:00Hello Roger,
two years or so ago, I built a RF-pow...Hello Roger,<br />two years or so ago, I built a RF-powered µW beacon, that worked from up 10µW RF - which you'll<br />find many hours per day on a few<br />meters of wire.<br />Used a discrete DC/DC converter and collected and stored the energy in a 1000µF capacitor.<br />But even with the increased propagation we enjoy now, who<br />is going to chase a 10...100µW<br />beacon that is transmitting a<br />short burst ( CW/MS-Hell ) every<br />ten minutes or so ?!<br />The LT-3108 works fine with low voltage, but draws a lot of current, which will be hard to get from any rectifier, while it fits fine for peltier-elements.<br />For your idea of exploiting 50Hz hum something like the<br />'Joule Thief' circuit might be a better solution, mine worked from<br />200mV/10µA for a 1.8V output with an effeciency comparable to that of the LT-chip.<br />Good Luck!<br />Peter/DL3PBAnonymousnoreply@blogger.com