Guaranteed To Triple Your Gas Mileage
Convert Your Car to USE WATER as well as Gasoline. Triple Your Gas Mileage for FREE Today!
4000+ Satellite TV Channels On Your PC
Download Satellite TV for PC Titanium Edition. Watch Live Satellite TV, Music and Movie Channels on your PC for Free!
·
500+
Worldwide Spy Cams
·
200+
Live Police Scanners
·
Find
Newsgroup Posted Files
·
Gain
Full Cyber-Spy.com
Access
·
Cyber-Spy.com
Resources Menu
To Watch FREE Satellite
TV On Your PC,
Click Here!
Access Powerful Live Online
Spying Tools And Resources:
·
500+
Fresh
Live Hidden Spy Cams
·
200+
Fresh
Live Police Scanners
·
Find
Hot
Newsgroups Posted Files
·
Fresh
Hot
Free E-Books Online
+ Powerful Investigation Tools
And More!
New User? Gain Full Access Here.
<p><font color="#000001"><b><font color="#116611"><i>Cyber-Spy.com</i></font> Index</b></font><small><br> · <a href="http://www.cyber-spy.com/ebooks/" target="IF1">15000+ <b>Fresh</b> Hot Free E-Books</a> · <a href="http://www.cyber-spy.com/tcst/aboutus.html" target="_NewDemo"><b>About Cyber-Spy.com</b></a><br> · <a href="http://www.cyber-spy.com/index.html"><i>TCST</i> Home Index</a><br> · <a href="http://www.cyber-spy.com/unet-bin/">Usenet Binaries Web-Archive</a><br> · <a href="http://www.cyber-spy.com/consumer-groups-index.html">Consum. Groups Web-Archive</a><br> · <a href="http://www.cyber-spy.com/wanted-groups-index.html">Wanted Groups Web-Archive</a><br> · <a href="http://www.cyber-spy.com/job-groups-index.html">Job Groups Web-Archive</a><br> · <a href="http://www.cyber-spy.com/fbi-index.html">The FBI Usenet Archive 1</a> <a href="http://www.cyber-spy.com/fbi-index2.html">2</a> <a href="http://www.cyber-spy.com/alt.politics.org.fbi-index.html">3</a><br> · <a href="http://www.cyber-spy.com/fbifile-report.htm">How To Get Your FBI File</a><br> · <a href="http://www.cyber-spy.com/electro-index.html">The Electronics Design Usenet</a><br> <a href="http://www.cyber-spy.com/electro-index10.html">Web Archive</a> <a href="http://www.cyber-spy.com/electro-index01.html">1</a>-<a href="http://www.cyber-spy.com/electro-index02.html">2</a>-<a href="http://www.cyber-spy.com/electro-index03.html">3</a>-<a href="http://www.cyber-spy.com/electro-index04.html">4</a>-<a href="http://www.cyber-spy.com/electro-index05.html">5</a>-<a href="http://www.cyber-spy.com/electro-index06.html">6</a>-<a href="http://www.cyber-spy.com/electro-index07.html">7</a>-<a href="http://www.cyber-spy.com/electro-index08.html">8</a>-<a href="http://www.cyber-spy.com/electro-index09.html">9</a><br> <a href="http://www.cyber-spy.com/electro-index1.html">1a</a>-<a href="http://www.cyber-spy.com/electro-index2.html">2a</a>-<a href="http://www.cyber-spy.com/electro-index3.html">3a</a>-<a href="http://www.cyber-spy.com/electro-index4.html">4a</a>-<a href="http://www.cyber-spy.com/electro-index5.html">5a</a>-<a href="http://www.cyber-spy.com/electro-index6.html">6a</a>-<a href="http://www.cyber-spy.com/electro-index7.html">7a</a>-<a href="http://www.cyber-spy.com/electro-index8.html">8a</a>-<a href="http://www.cyber-spy.com/electro-index9.html">9a</a><br> · <a href="http://www.cyber-spy.com/world.html">Domain Data Index Pages</a> <a href="http://www.cyber-spy.com/world14.html">2</a><br> <a href="http://www.cyber-spy.com/world01.html">1</a>-<a href="http://www.cyber-spy.com/world02.html">2</a>-<a href="http://www.cyber-spy.com/world03.html">3</a>-<a href="http://www.cyber-spy.com/world04.html">4</a>-<a href="http://www.cyber-spy.com/world05.html">5</a>-<a href="http://www.cyber-spy.com/world06.html">6</a>-<a href="http://www.cyber-spy.com/world07.html">7</a>-<a href="http://www.cyber-spy.com/world08.html">8</a>-<a href="http://www.cyber-spy.com/world09.html">9</a>-<a href="http://www.cyber-spy.com/world10.html">10</a>-<a href="http://www.cyber-spy.com/world11.html">11</a>-<a href="http://www.cyber-spy.com/world12.html">12</a>-<a href="http://www.cyber-spy.com/world13.html">13</a><br> <a href="http://www.cyber-spy.com/world1.html">1a</a>-<a href="http://www.cyber-spy.com/world2.html">2a</a>-<a href="http://www.cyber-spy.com/world3.html">3a</a>-<a href="http://www.cyber-spy.com/world4a.html">4</a>-<a href="http://www.cyber-spy.com/world5.html">5a</a>-<a href="http://www.cyber-spy.com/world6.html">6a</a>-<a href="http://www.cyber-spy.com/world7.html">7a</a>-<a href="http://www.cyber-spy.com/world8.html">8a</a>-<a href="http://www.cyber-spy.com/world9.html">9a</a><br> <a href="http://www.wedoitallsolutions.com">Commission Blueprint</a> <a href="http://www.wedoitallsolutions.com/gold">Gold Investing</a> <a href="http://www.mangavolt.com">MangaVolt Cartoons</a> </small></p>
Top 10
Cyber-Spy.com
Resources
(Most Popular Resources)
·
Live Worldwide Spy Cams
·
Live Police Scanner Feeds
·
Search Live Fed/Nat Records
·
Unlisted Phone/Address Tools
·
Public Records Research Tools
·
Most Wanted Criminals List
·
Free Electronic References
·
Credit Bureau Search Tools
·
Reverse Directory Search
·
Airline/Aviation Resources
Cyber-Spy.com
Live Spy Tools
Since 1998. Population:
Your Ad Here
Your Ad Here
Your Ad Here
/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: "Fritz Schlunder" <srentacow@nospam.yahoo.com> Newsgroups: sci.electronics.design,sci.electronics.misc References: <3e28104a$0$19428$a729d347@news.telepac.pt> Subject: Re: Current sinking circuit instability Date: Fri, 17 Jan 2003 10:11:03 -0700 X-Newsreader: Microsoft Outlook Express 5.50.4522.1200 NNTP-Posting-Host: 66.218.239.188 Message-ID: <3e283836$1_1@corp.newsgroups.com> X-Comments: This message was posted through Newsfeeds.com X-Comments2: IMPORTANT: Newsfeeds.com does not condone, nor support, spam or any illegal or copyrighted postings. X-Comments3: IMPORTANT: Under NO circumstances will postings containing illegal or copyrighted material through this service be tolerated!! X-Report: Please report illegal or inappropriate use to <abuse@newsfeeds.com> X-Abuse-Info: Please be sure to forward a copy of ALL headers, INCLUDING the body (DO NOT SEND ATTACHMENTS) Organization: Newsfeeds.com http://www.newsfeeds.com 80,000+ UNCENSORED Newsgroups. "Nick" <virg.in@virgin.net(nospam)> wrote in message news:3e28104a$0$19428$a729d347@news.telepac.pt... > Hi, > > I have a simple current sinking circuit designed to test DC power supplies > up to 5V, 10A. Not being much of an ASCII artist, the circuit is described > as follows: > > An LM351 opamp output is connected to the Gate of a BUZ71 (50V,14A) MOSFET, > the Source of the FET is fedback to the -ve input of the opamp and a > potential divider with POT provides an input to the +ve input to the opamp. > There is also 0.1 ohm power resistor connected between the FET Source and > ground (so a 200mV change on the opamp input sinks 200mA) > The power supply under test is connected accross the FET Drain and the > circuit ground. > The supply required for the opamp and opamp input voltage is provided by a > 9V battery so as not to load the EUT. > > The circuit appears to work ok, (ie when the EUT output is measured with a > meter it is sinking the correct range of current) but when I looked on a > scope I see +-200mV or so oscillations, as more current is drawn from the > EUT, the instability worsens. > > The FET is working in its non-linear region (which could be the cause the > problem?) but i am having trouble finding any devices of a suitable Id value > (10A) that have a more linear characteristic at low values of Vgs. > > Any thoughts much appreciated. > > > Nick Winfield Hill's suggestions aught to solve your loop stability issues, but I was just noticing something. 5v times 10amps equals 50Watts. With 0.1 ohms in series at 10A the resistor will dissipate 10Watts. This means the other 40Watts will be dissipated in the MOSFET, but if we look at the BUZ71 datasheet (http://www.fairchildsemi.com/ds/BU/BUZ71.pdf) we notice that the absolute maximum power dissipation rating at a case temperature of 25 deg. C is 40W. In practice that 40W figure is a rather fanciful rating unless you intend to use less than room temperature cooling methods such as peltiers or phase change refrigeration. Assuming you are running this thing for more than a couple seconds at a time I should imagine the device would be more reliable using a somewhat larger MOSFET (with lower thermal resistance junction to case values). That would also make your heatsinking task dramatically more feasible (IE, possible)... -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =----- </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>