reko Posted September 21, 2006 Report Share Posted September 21, 2006 Hey everyone well Audio Guru u helped alot in the sensors topic i would like to ask again for help on a certain subject i found all of u guys making a hell of a discusion about well I was planning on controlling a dc motor with brushes and commutator to work with atmel at89c2051 mcu (Using pulse width modulation) well i got everything from the tutorial u linked here about the pwg through a bridge to control motor and btw the code there is simple i am a computer science student so i know about it the problem here is that i planned to use the l293d which is equipped with spike-protecting diodes and rated 600 mA per channel but the only bridge i managed to get is a l293B which isn't equipped with the diode and also rated 1A per channel that could be a problem so my question is (Is it possible to use that bridge with a dc non-stepper motor or what?)P.S:Audio guru u really helped last time i hope u do this time :) Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 22, 2006 Report Share Posted September 22, 2006 the only bridge i managed to get is a l293B which isn't equipped with the diode and also rated 1A per channel that could be a problem so my question is (Is it possible to use that bridge with a dc non-stepper motor or what?Its datasheet shows where to connect external diodes and how it is used with DC motors having brushes and a commutator.If your motor draws more than 1A when starting, working hard or is stalled, then the IC will make lots of smoke. Quote Link to comment Share on other sites More sharing options...
reko Posted September 22, 2006 Author Report Share Posted September 22, 2006 thanks man but what diode should i use can i use the ln4004 ?? here's the schematic for the circuit as u can see the bridge is l293D which is unavailable as i said before and there's no hope i will find it Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 22, 2006 Report Share Posted September 22, 2006 A 1N4004 is a rectifier diode for 50Hz or 60Hz and is very slow. PWM at high frequencies needs faster diodes. I don't have a list of fast diodes. I need one also. Quote Link to comment Share on other sites More sharing options...
reko Posted September 22, 2006 Author Report Share Posted September 22, 2006 what about ln4448 diode i guess it's fast enough (What is in mind??) Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 22, 2006 Report Share Posted September 22, 2006 what about ln4448 diode i guess it's fast enoughIts max current is only 300mA. Is your motor that small? Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted September 22, 2006 Report Share Posted September 22, 2006 Would it be possible to use this IC to drive large Transistors like a 2N3055 so the circuit can handle Large loads?http://www.cse.cuhk.edu.hk/~khwong/ceg3430/mrobot7.pdf Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted September 22, 2006 Report Share Posted September 22, 2006 Search ResultsL293B and L293Ehttp://www.st.com/stonline/books/pdf/docs/1328.pdfL293DST Datasheethttp://www.st.com/stonline/books/pdf/docs/1330.pdfTI Datasheethttp://focus.ti.com/lit/ds/symlink/l293d.pdfApp Noteshttp://msgroups.tech.northwestern.edu/dc/dc99/docs/l293eapp1.pdfhttp://www.st.com/stonline/products/literature/an/1675.pdfOther Infohttp://www.cse.cuhk.edu.hk/~khwong/ceg3430/mrobot7.pdfhttp://www.dprg.org/projects/1998-04a/http://www.seattlerobotics.org/encoder/may98/steppers.htmlhttp://www.cs.uiowa.edu/~jones/step/circuits.htmlhttp://www.stanford.edu/~pjc30943/school/ME218%20labs/KrisPaulSal%20-%20Lab%208%20Report.dochttp://www.me.umn.edu/courses/me2011/robot/technotes/L293/L293.html Quote Link to comment Share on other sites More sharing options...
reko Posted September 23, 2006 Author Report Share Posted September 23, 2006 thanks guys i found the l293D whixh is 600mA output and my motor is 500 mA so i guess it's almost okey to use that bridge directly Quote Link to comment Share on other sites More sharing options...
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