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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: EskWIRED@panix.SPAMBLOCK.com Newsgroups: sci.electronics.design Subject: Re: Triac Hack? Date: Mon, 23 Sep 2002 02:33:57 +0000 (UTC) Organization: Transcontinental Telegenetics, Ltd. Message-ID: <amluil$p70$2@reader2.panix.com> References: <am8nep$5ue$1@reader1.panix.com> <amas7q$t73$2@woodrow.ucdavis.edu> <Bipj9.7537$DR.423597@newsfep2-win.server.ntli.net> <amluea$p70$1@reader2.panix.com> NNTP-Posting-Host: panix3.panix.com NNTP-Posting-Date: Mon, 23 Sep 2002 02:33:57 +0000 (UTC) x-no-archive: yes User-Agent: tin/1.4.6-20020816 ("Aerials") (UNIX) (NetBSD/1.5.4_ALPHA (i386)) [ This is a repost of the following article: ] [ From: EskWIRED@panix.SPAMBLOCK.com ] [ Subject: Re: Triac Hack? ] [ Newsgroups: sci.electronics.basics,sci.electronics.circuits ] [ Message-ID: <amluea$p70$1@reader2.panix.com> ] j.f.palmer <j.f.palmer@ntlworld.com> wrote: >> : EskWIRED@panix.spamblock.com wrote: >> : I use a standard 600 watt dimmer switch in an unconventional way - to >> : control the speed of a fan motor in a hot air popcorn popper which I use >> : to roast coffee. It works well. > The circuit you will need is a switch mode power supply. By switching the > motor on and off rapidly and adjusting the 'on' and 'off' timing a very > efficient motor control system can be made. I know what you are thinking.... > Bloody complex. It really isn't though. But doesn't my light dimmer do exactly that? It uses a triac to switch the power off every time the AC waveform passes the zero line, and then turns on again later in the waveform. It currently works well enough. I'm not looking to replace the whole thing, but rather, to refine it by increasing the resolution. It is a standard rotary light dimmer switch, rated at 600 watts. I have it feeding the primary side of a simple 24 volt transformer, which in turn feeds a simple full bridge rectifier. All I want to do is to figure out what value pot to replace the standard one with, so that I can turn it further (for more resolution) and ideally, so I can turn it all the way and still have to motor turn enough to prevent the heater coils from getting excessively hot. Another idea ocurred to me, which is to put a resistor in parallel with the pot, so that the effective value of the pot is reduced, and when the pot is turned to full value, enough juice still flows. How can I determine the optimal value for the pot? Or the resistor? And which method makes more sense? And why is everyone telling me to replace the whole thing, when it currenly works pretty well? All I want to do is to tweak the value, so it works somewhat better. -- If you can't say something nice, say something surrealistic. - Zippy -- If you can't say something nice, say something surrealistic. - Zippy </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>