EC Kaathal JPG

EC Kaathal...

I wrote this one when I was doing my 5th Sem ECE when HOD was taking class... :) Enjoy!

not able to c the story? install tamil fonts http://www.higopi.com/fonts/

or check out the Jpeg version at

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjDZvZJYFNGI5u5I43eQDMXdVhJ5Wr22JT-JBpikGuBY-1lkUD7pXlIWrYROTi5S9QUgY0p5BNnxUCJ1QHBUyG7aGf85iw0xkye61bmogiW9usZJtUtyv7PaiDe7uyiLftm2JnAUAgoxgw/s1600/Final.JPG

EC ¸¡¾ø...

«Åû infinity-ø ÅóÐ ¦¸¡ñÊÕôÀ¨¾ ±ÉÐ ¸ñ¸û input Å¡í¸¢Â×¼ý, ±ý ÁÉõ Heat Sink þøÄ¡¾ Transistor §À¡ø ݼ¡ÉÐ. «Åû «Õ¸¢ø Åà Åà ±ÉÐ ¨¸¸Ç¢ý pulseý amplitute «¾¢¸Á¡ÉÐ.þýÈ¡ÅÐ ±ý ¸¡¾¨Ä «ÅÇ¢¼õ communicate Àñ½¢ Å¢¼Ä¡õ ±ýÚ ±ý voice-³ º¢È¢Ð Modulate ¦ºöÐ ¸¡ò¾¢Õó§¾ý. «Åû †¡Â¡¸ '†¡ö' ÜȢɡû. ¿¡Ûõ '†¡ö' ±ý§Èý. «¾üÌ §Áø ±ý ¿¡Å¢Ä¢ÕóÐ Åó¾ o/p ±ýÉ ±ýÚ ¦¾È¢óÐ ¦¸¡ûÇ «ÅÇÐ ¸¡Ð¸Ç¢ý senistivity Àò¾¡Ð!

¯í¸Ù측¸ attenuate ¬É «ó¾ Å¡÷ò¨¾¸¨Ç ºüÚ Amplify ¦ºö¸¢§Èý. "I love You..." - þ¨Å ¾¡ý «¨Å. «Åû ÍüÚôÒÈò¾¢ø ±í¸¡ÅÐ þÕó¾¡§Ä ±ý Áɾ¢ý behaviour «º¡¾¡Ã½Á¡¸§Å þÕìÌõ. Heart Beat-¸Ç¢ý frequency critical frequency-ìÌ §Áø «¾¢¸Á¡¸¢ÈÐ. Áɾ¢ý «Ê¢ø (Valence Band) þÕìÌõ ¬¨º (electrons) excite ¬¸¢ Áɾ¢ý boundary-¸¨Ç (conduction band) ÅóÐ Óðθ¢ÈÐ.

Transistorý operating point³ Active RegionìÌ ¦¸¡ñÎ §À¡¸ biasing resistors³ ¿¡ÎŨ¾ §À¡Ä, «Å¨Ç ±ý ¸¡¾ø regionìÌ ¦¸¡ñÎ Åà «ÅÇÐ §¾¡Æ¢¸¨Ç ¿¡Êý§Èý. ±ÉÐ base band signal ¬É ±ý ¸¡¾¨Ä (em), ±Ð¨¸ , §Á¡¨É§Â¡Î §º÷òÐ ¸Å¢¨¾Â¡¸ Á¡üÈ¢ (modulation) ¸Ê¾õ ±ýÛõ carrierø (eam) Àò¾¢ÃÁ¡¸ ¨Åò§¾ý. Propagate ÀñÏžüÌ ´Õ channel ¾¡ý ¾ü§À¡Ð §¾¨Å!

«ÅÇÐ §¾¡Æ¢¸û ¡ÃÅÐ ÅÕ¸¢È¡÷¸Ç¡ ±ýÚ À¡÷ò§¾ý. ºüÚ §¿Ãò¾¢ø «ÅÇÐ §¾¡Æ¢ ´Õò¾¢ ¦¾ýÀð¼¡û. «ÅÇ¢¼õ ¦¸¡Îò¾ÛôÀ¢É¡û atmosphere-ø transmit ¦ºöÅÐ §À¡Ä...Receiver-³ ¦ºýȨ¼ÔÁ¡ ±ýÀÐ ºó§¾¸õ ¾¡ý. Time period «¾¢¸Á¡¸¢Ôõ ¿¡ý ¸¡ò¾¢Õó§¾ý. Fiber Optic cable §À¡ýȦ¾¡Õ §¾¡Æ¢ Åó¾¡û. Letter ¯ûÇ Òò¾¸ò¨¾ ±ýÉÅÇ¢¼õ ¦¸¡ÎìÌÁ¡Ú ÜÈ¢ Å¢¨¼ ¦Àü§Èý. Fiber optic cable efficient-¬¸ receiver-³ ¦ºýȨ¼Å¡û ±ýÚ ¿õÀ¢§Éý! Áɾ¢ø þÉõ ÒȢ¡¾ ´Õ Ì„¢. þÁÂÁ¨Ä¢ý ¯îº¢Â¢ø ¦ºýÚ ¦¸¡Ê ¿¡ðÊÂÐ §À¡Ä, ¦¾¡¼÷óÐ ³óÐ experiment-¸û lab-ø repeat Å¡í¸¡Áø ¦ºö¾Ð §À¡ø ´Õ Ìà¸Äõ.

'¦Åñ½¢Ä§Å ' À¡¼¨Ä low amplitude-ø hum ¦ºö¾ÀÊ canteen-ìÌ ¬ð¼õ, µð¼õ ÁüÚõ ¿¨¼Â¡¸ ¦ºý§Èý. «í§¸ ±ýÉÅû ... «Á÷ó¾¢Õó¾¡û. «Õ¸¢ø ¡§Ã¡ ´ÕÅý. þÕÅ¡¢ý þ¨¼§Â ´§Ã coke «¾¢ø þÃñÎ straw-ì¸û. ±ý¨É À¡÷òÐ º¢¡¢ò¾ÀʧÂ, "þÐ ±ý '¬û'" ±ýÚ «Å¨É ±ÉìÌ introduce ¦ºöÐ ±ý ¸¡¾¨Ä conclude-õ ¦ºö¾¡û. ±ý Áɾ¢ý Voltage, breakdown voltage -ìÌ §Áø ¦ºýÚ breakdown ¬É¾¢ø, ¸ñ¸û º¢Åó¾É. Reverse Current (¸ñ½£÷) ±ô§À¡Ð §ÅñÎÁ¡É¡Öõ flow ¬¸Ä¡õ. «ô§À¡Ð, fiber optic cable ±ÉÐ Á¼¨Ä (eam) ¦¸¡ñÎ «í§¸ Åó¾¡û! ¿øħŨÇ! Propagation Delay «¾¢¸Á¡¸ þÕ󾾡ø, Channel-ø Åó¾ ¦ºö¾¢ Receiver-³ ¦ºýȨ¼ÂÅ¢ø¨Ä. ±É째 «ó¾ Òò¾¸õ §ÅñΦÁýÚ fiber optic-¸¢¼Á¢ÕóÐ «ó¾ Òò¾¸ò¨¾ ¦ÀüÚ ¦ºýÚÅ¢ð§¼ý.

±ýÉÅû....þø¨Ä.... «Åû ´Õ «Æ¸¡É SL100 NPN transistor.... «ÅÙ째üÈ ´Õ SP100 PNP transistor ±ýÚ ¿¡§É ±ý¨É ºÁ¡¾¡ÉôÀÎò¾¢ì¦¸¡ûÇ ÓÊÂÅ¢ø¨Ä.Lab-ø º¡¢Â¡É input ¦¸¡ÎòÐõ output ÅÃÅ¢ø¨Ä ±ýÈ¡§Ä ÁÉõ «¾¨É ²üÚ즸¡ûÇ ÁÚ츢ÈÐ. ºüÚ ÓýÒ Å¨Ã þÕó¾ ºó§¾¡„¦ÁøÄ¡õ, Clipper Circuit -ø ¦¸¡Îò¾ signal §À¡Ä Clip-¬¸¢ ¸¡½¡Áø §À¡ÉÐ! Experiment-ø §ÅñÎÁ¡É¡ø repeat-¸û þÕì¸Ä¡õ! Incident-¸û repeat ¬¸¡!

ShahJahaný ¸¡¾ø º¢ýÉÁ¡¸ «ÅÉÐ ¸¡¾Ä¢Â¢ý ¸øĨÈ. ²ÉÐ ¸¡¾ø º¢ýÉÁ¡¸ ±ý ¸¡¾Ä¢ý ¸øÄ¨È - «ó¾ ¸Ê¾õ!