tag:blogger.com,1999:blog-4628000210909444492011-11-28T04:49:59.525+05:30Driver circuit for Luxeon LEDs for use in Free Space Optical LinksYaduvanshihttp://www.blogger.com/profile/02000639860091247800noreply@blogger.comBlogger11100tag:blogger.com,1999:blog-462800021090944449.post-40270025496265914732008-01-30T21:59:00.003+05:302008-02-24T15:18:42.157+05:30<a href="http://bp0.blogger.com/_G_ts4r7PxRY/R8E9a8LKxHI/AAAAAAAAAik/MY3r8ATjH94/s1600-h/SCHEMATIC.jpg"><img id="BLOGGER_PHOTO_ID_5170481380236903538" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="http://bp0.blogger.com/_G_ts4r7PxRY/R8E9a8LKxHI/AAAAAAAAAik/MY3r8ATjH94/s320/SCHEMATIC.jpg" border="0" /></a><br /><div><a href="http://bp0.blogger.com/_G_ts4r7PxRY/R8E7P8LKxGI/AAAAAAAAAic/XkA70sX4xMc/s1600-h/SCHEMATIC.jpg"></a><br /><br /><div><a href="http://bp2.blogger.com/_G_ts4r7PxRY/R77w2MLKxBI/AAAAAAAAAhc/RjkEBqEy6es/s1600-h/DSC01508.JPG"><img id="BLOGGER_PHOTO_ID_5169834236039578642" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="http://bp2.blogger.com/_G_ts4r7PxRY/R77w2MLKxBI/AAAAAAAAAhc/RjkEBqEy6es/s320/DSC01508.JPG" border="0" /></a><br /><a href="http://bp0.blogger.com/_G_ts4r7PxRY/R77w2sLKxCI/AAAAAAAAAhk/M4nG58M0Zfs/s1600-h/DSC01510.JPG"><img id="BLOGGER_PHOTO_ID_5169834244629513250" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="http://bp0.blogger.com/_G_ts4r7PxRY/R77w2sLKxCI/AAAAAAAAAhk/M4nG58M0Zfs/s320/DSC01510.JPG" border="0" /></a><br /><a href="http://bp2.blogger.com/_G_ts4r7PxRY/R77w3MLKxDI/AAAAAAAAAhs/fpOZ-WlTn5Q/s1600-h/DSC01514.JPG"><img id="BLOGGER_PHOTO_ID_5169834253219447858" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="http://bp2.blogger.com/_G_ts4r7PxRY/R77w3MLKxDI/AAAAAAAAAhs/fpOZ-WlTn5Q/s320/DSC01514.JPG" border="0" /></a><br /><a href="http://bp0.blogger.com/_G_ts4r7PxRY/R77w3sLKxEI/AAAAAAAAAh0/wPMjFsRJ3h8/s1600-h/DSC01512.JPG"><img id="BLOGGER_PHOTO_ID_5169834261809382466" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="http://bp0.blogger.com/_G_ts4r7PxRY/R77w3sLKxEI/AAAAAAAAAh0/wPMjFsRJ3h8/s320/DSC01512.JPG" border="0" /></a><br /><a href="http://bp2.blogger.com/_G_ts4r7PxRY/R77w4MLKxFI/AAAAAAAAAh8/IGpIbhCrvD0/s1600-h/DSC01517.JPG"><img id="BLOGGER_PHOTO_ID_5169834270399317074" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="http://bp2.blogger.com/_G_ts4r7PxRY/R77w4MLKxFI/AAAAAAAAAh8/IGpIbhCrvD0/s320/DSC01517.JPG" border="0" /></a><br /><br /><br /><div><a href="http://bp2.blogger.com/_G_ts4r7PxRY/R77tcMLKxAI/AAAAAAAAAhU/_Fyxp-eRQGY/s1600-h/DSC01509.JPG"><img id="BLOGGER_PHOTO_ID_5169830490828096514" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; CURSOR: hand" alt="" src="http://bp2.blogger.com/_G_ts4r7PxRY/R77tcMLKxAI/AAAAAAAAAhU/_Fyxp-eRQGY/s400/DSC01509.JPG" border="0" /></a><br /><br /><br /><br /><div><br /><br /><br /><br /><br /><br /><div><br /><br /><br /><br /><br /><br /><br /><div><br /><br /><br /><br /><br /><br /><div><a href="http://bp2.blogger.com/_G_ts4r7PxRY/R6RoBROnv1I/AAAAAAAAAR8/Yv_AasdOJJU/s1600-h/DSC01488.JPG"><img id="BLOGGER_PHOTO_ID_5162365443887316818" style="FLOAT: left; MARGIN: 0px 10px 10px 0px" alt="" src="http://bp2.blogger.com/_G_ts4r7PxRY/R6RoBROnv1I/AAAAAAAAAR8/Yv_AasdOJJU/s400/DSC01488.JPG" border="0" /></a></div><br /><br /><br /><br /><br /><br /><div>1. To drive Luxeon star LED for use with ronja <a href="http://ronja.twibright.com/">http://ronja.twibright.com/</a>) or for some other Free space optical link three stacked 74HC245 ICs can be used as shown in the circuit diagram, this can give currents in the orders of 350mA .Important : Do not forget to put an additional heat sink for the LED besides its built in heatsink .There is a star LED with optics available which has beamwidth of 10 degrees and optical efficiency of almost 85% so ranges will be extremely good in case luxeon star with optics is used instead of normal star LED which has very large beamwidth ( 100 degrees approx)</div><br /><br /><br /><br /><br /><br /><div>2. The waveforms of the tests carried out at 10 MHz and 1 MHz are shown in the figures .<br /><br />3. The luxeon Star luminled is much more powerful and bright compared to Superflux LEDs which are not available easily everywhere in the world in small quantities.</div><br /><br /><br /><br /><p align="right"><a href="http://bp1.blogger.com/_G_ts4r7PxRY/R6RpOBOnv4I/AAAAAAAAASU/afcVanM33qY/s1600-h/DSC01489.JPG"><img id="BLOGGER_PHOTO_ID_5162366762442276738" style="FLOAT: left; MARGIN: 0px 10px 10px 0px" alt="" src="http://bp1.blogger.com/_G_ts4r7PxRY/R6RpOBOnv4I/AAAAAAAAASU/afcVanM33qY/s400/DSC01489.JPG" border="0" /></a></p><br /><br /><br /><br /><div><br /><br />4. If this LED is used with slight modification to the transmitter better ranges can be obtained compared to normal ronja link using superflux LEDs.<br /><br /><br />5. Figures below show Signal generator output on Channel 1 and Reciever ouput on Channel2 at 1 MHz and 10 MHz respectively<br /><br /><a href="http://bp1.blogger.com/_G_ts4r7PxRY/R6RoQBOnv2I/AAAAAAAAASE/EZWJBwkG2R0/s1600-h/1MHz.JPG"><img id="BLOGGER_PHOTO_ID_5162365697290387298" style="FLOAT: left; MARGIN: 0px 10px 10px 0px" alt="" src="http://bp1.blogger.com/_G_ts4r7PxRY/R6RoQBOnv2I/AAAAAAAAASE/EZWJBwkG2R0/s400/1MHz.JPG" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><a href="http://bp1.blogger.com/_G_ts4r7PxRY/R6RooBOnv3I/AAAAAAAAASM/lNBszA_xpgY/s1600-h/10MhZ.JPG"><img id="BLOGGER_PHOTO_ID_5162366109607247730" style="FLOAT: left; MARGIN: 0px 10px 10px 0px" alt="" src="http://bp1.blogger.com/_G_ts4r7PxRY/R6RooBOnv3I/AAAAAAAAASM/lNBszA_xpgY/s400/10MhZ.JPG" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://bp0.blogger.com/_G_ts4r7PxRY/R6i0sxOnv9I/AAAAAAAAAS4/lFsyTYaPgSE/s1600-h/waveforms.jpg"><br /></a></div><a href="http://bp2.blogger.com/_G_ts4r7PxRY/R6CmvROnvwI/AAAAAAAAARQ/afpzTDbWszs/s1600-h/screenshot.JPG"></a></div></div></div></div></div></div><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/462800021090944449-4027002549626591473?l=luxeonstar.blogspot.com' alt='' /></div>Yaduvanshihttp://www.blogger.com/profile/02000639860091247800noreply@blogger.com10