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				<managingEditor>contact@nospam.com (Ajay Bhargav)</managingEditor>
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				<pubDate>Thu, 08 Jan 2009 20:38:11 -0800</pubDate>
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						<title>doubt regarding 89c51 i/p</title>
<link>http://www.8051projects.net/forum-t715.html</link>
<description><![CDATA[I am getting a sine wave from an band pass filter and using a schmit trggr ckt, i am shaping  it as a square wave, i want it to feed to  MCU. I am using  89c51 for operating a 12v relay( by generating PWM).<br /><span class='bbcode underline' style='text-decoration:underline'>Now the problem is that i have to level shift the schmit trigger o/p (1.22v- 1.88v) to a digital pulse (h1gh or l0w) so as to use it to MCU i/p.</span> <br />how can i  do this?<br />can u plz help me?<br /><br /><br /><br />Vth+ |   |----|   |----|1.88v<br />vth-  |__|     |__|     |1.22v<br />                             <br />                             _________0v<br />                             .<br />                             .<br />                             .<br />o/p reqd:                .<br /><br />__________________1<br />                            |_________0<br /><br />_<br /><br />]]></description>
<pubDate>Tue, 17 Apr 2007 05:05:45 -0700</pubDate>
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						<title>Re: doubt regarding 89c51 i/p</title>
<link>http://www.8051projects.net/forum-t715.html</link>
<description><![CDATA[use diode clamping circuit.. <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />  for level shifting. google it for more information of clamping circuits..]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 17 Apr 2007 05:07:11 -0700</pubDate>
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