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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: Spehro Pefhany <speff@interlog.com> Newsgroups: sci.electronics.design Subject: Re: Voltage Reference With LM4041DIZ-ADJ Organization: Rather Message-ID: <vpqh0v0621v4q0j388sps1o5r2rtb6h99d@4ax.com> References: <20021224181212.07939.00000503@mb-fw.aol.com> X-Newsreader: Forte Agent 1.92/32.572 Date: Tue, 24 Dec 2002 23:24:09 GMT NNTP-Posting-Host: 24.112.151.88 NNTP-Posting-Date: Tue, 24 Dec 2002 18:24:09 EST On 24 Dec 2002 23:12:12 GMT, the renowned ee0035jr@aol.comnojunk (Ed Edmondson) wrote: >I need a voltage reference for a resistive bridge circuit. I have a lm358 >comparator used to turn on a resistive load when a thermistor in the bridge >falls below a preset value (about 2.5 volts). > >The circuit is run off of 5 volts and uses an LM2940T-5.0 regulator to supply >the 5 volts necessary for the circuit. To increase the circuit accuracy I have >used a 0.2 degree tolerance thermistor as the sensing element. The remaining >resistors are in the bridge are 0.1 percent tolerance. >I was going to use the unregulated DC voltage to power the voltage reference >for the bridge. How do I increase the current capacity on the reference to >allow it to power the resistive bridge circuit? You shouldn't need any fancy reference, the LM2940 should be good enough, provided it stays in regulation. You've got a ratiometric circuit- the exact excitation voltage is unimportant. Worry more about self-heating effects (you're operating in water, right?) and Vos of your op-amp comparator, which could be as much as 5 mV. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>