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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: "Sir Charles W. Shults III" <aichip@cfl.rr.com> Newsgroups: sci.electronics.design References: <sizam-3AA5BB.14100721102002@news.stanford.edu> <mS%s9.10716$r7.382095@twister.tampabay.rr.com> <sizam-6B287E.16294221102002@news.stanford.edu> Subject: Re: Help, design behind a variable current power supply, w/o pots. X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 Message-ID: <086t9.140115$S8.2518308@twister.tampabay.rr.com> Date: Tue, 22 Oct 2002 06:21:48 GMT NNTP-Posting-Host: 65.35.5.15 NNTP-Posting-Date: Tue, 22 Oct 2002 02:21:48 EDT Organization: RoadRunner - Central Florida Okay, let's take a pretty typical design approach- break it down into blocks. First, you have an input section that takes some sort of control signals such as digital inputs and uses that information to switch something on or off. In this case, what we switch will depend on how we control our current source. Next, you will need something that produces a current on demand, and a simple means of programming it. You may use a simple resistor-programmed current source, or you may use a voltage to current converter. In either case, you now have to interface the first part (the input section) with the second part (the current source). If you have a voltage to current converter, you will want your input section to produce different voltages based on your input, then feed that resulting voltage to the voltage to current converter. This will give you one way of doing what you want. This also means that your input section in nothing more than a digital to analog converter (available as a single device). If you have a current amplifier, you will program it with an input current and get some sort of output current from it. You may use simple transistors to do the switching- that is a simple means of doing it. Break your current into binary ranges, then pick some transistors and resistors that provide those step sizes. A transistor acts as a simple switch if you saturate it- that means drive it to its input limits. No input signal will be off, an input signal that forces it all the way on will make it switch as "on" as it can get. The transistor will have some resistance, and so will a resistor in series with it. Turning the transistor fully on will allow some sort of current to flow through it, and the resistor in series with it will be used to program that current to a value you want. By placing these transistor switches in parallel, you can sum the currents from switching them on in any combination, allowing you to create any value you wish. Note that transistors and other semiconductors will change their resistances with temperature, so if you have a precision application, this will be a poor solution. For brute force, however, it will work. Also, you can compensate for temperature change with a diode, but that is a little beyond the scope of this short message. Cheers! Chip Shults My robotics, space and CGI web page - http://home.cfl.rr.com/aichip </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>