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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: "Frank Bemelman" <bemelmanx@euronet.nl.invalid> Newsgroups: sci.electronics.design References: <3d9f4bd3$0$11211$1b62eedf@news.euronet.nl> <3DA07D50.CE258815@webaccess.net> Subject: Re: steppermotor as encoder -> presto, moterized pot. (Poor man's rate drive) Date: Sun, 6 Oct 2002 22:05:40 +0200 X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 Message-ID: <3da0979d$0$11194$1b62eedf@news.euronet.nl> Organization: EuroNet Internet NNTP-Posting-Date: 06 Oct 2002 20:05:50 GMT NNTP-Posting-Host: hlg-n-5c88.mxs.adsl.euronet.nl "Chuck Simmons" <chrlsim@webaccess.net> schreef in bericht news:3DA07D50.CE258815@webaccess.net... > Frank Bemelman wrote: > > > > Just had an idea, and I'm not planning to actually build > > something, but liked to share the idea - if it is an idea. > > > > What we want is a moterized pot for a homemade amplifier, > > so that it can be controlled both manually and by remotecontrol. > > Since we lack mechanical skills (not me of course) we want it to > > be mechanically simple. For cosmetic reasons we want the volume > > knob to turn as well, when using the remote. > > > > Okay. We use a size 17 steppermotor from an old 5.25 floppy > > drive. Some circuit to convert to logic levels, a PIC > > to decode etc. Now we have a signal to control a digital > > volume control. Easy. > > > > PIC also controls 4 outputs (steppers from floppydrives are > > often unipolar) if the remote wants to move the 'pot'. In this > > case, the software ignores the inputs, and simply increases > > or decreases the control of the *digital* pot, and stepping > > the motor with knob accordingly. > > I can't resist. I built this as a simple telescope drive for an 8 inch > f/D=6 telescope on an inverted fork mount. I did this back in about > 1975 using 4000 series CMOS plus some transistors for power drivers. > The motor was a Superior Electric 200 steps per turn stepper. > _____ ___________________ _____________ > | | | | | |----- A > | Osc |--+----| Fixed divide by n |--+--| Toggle Flop | > |_____| | |___________________| | |_____(JK)____|o---- !A > | | > | | _____________ > | | | |----- B > | +-o| Toggle Flop | > | |_____(JK)____|o---- !B > | ______________________ _____________ > | | | | |----- C > +----| Variable divide by m |---| Toggle Flop | > |______________________| |_____(JK)____|o---- !C > | > | > ___________|___________ > | | > | Modulus switches | > |______________________| > > > ____________ ___________________ > A-------| | | | > | Phase Det. |------| Filter + Motor PA |--- To Motor > C-------|____________| |___________________| > > ____________ ___________________ > B-------| | | | > | Phase Det. |------| Filter + Motor PA |--- To Motor > C-------|____________| |___________________| > > Signals A and B are quadrature. When m and n are equal, the motor does > not turn m>n and the motor turns one way and m<n it turns the other. > All but the filter and motor power amplifier could be software. Clue. > A phase detector is an exclusive or. The motor coils are driven with > quadrature triangle waves in this scheme. Ideal is sinusoidal. The rate > in this drive as used was one revolution in 23 hours 56 minutes after a > 55:1 worm. The rate could be adjusted slow or fast by changing m. While I don't understand a single bit of the above, I get a taste of your enthusiasm. I did some silly things in the past, using bucket brigades as shiftregisters, and forgot *and* rediscovered these devices don't weren't meant to clock as static devices, etc. It were really the times that you could use incredible amounts of hardware to perform a specific task. Schematics that would cover the entire floor, all scibbled with pencils, and using hundreds of meters wirewrapped wire on dozens of cards in a cardframe, and *still* understanding where your were. All good memories, but i'm happy that today with have other options to fullfill equally complex designs. Yet, I did feel more like a magician those days, seems like that the physical dimensions alone had some extra value that simply can't compensate for the rather *physical* small stuff I produce today. Don't get me wrong, I do enjoy 'small' projects using a simple uC, whenever it fits the job. -- Thanks, Frank Bemelman (remove 'x' & .invalid when sending email) </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>