Guest Kasamiko Posted October 14, 2004 Report Share Posted October 14, 2004 I need a simple setup to measure the voltage being put out by my serial and parallel port..any suggestions? ???rhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
ante Posted October 14, 2004 Report Share Posted October 14, 2004 Hi Rhonn,The voltage put out by the ports can be viewed on an oscilloscope or measured with a multi-meter. Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted October 14, 2004 Report Share Posted October 14, 2004 Nice to hear from you again Ante.. ;D Yes I like to do that, but my digital tester can't simply lock on it..maybe I needs some diodes and caps on particular pins to measure it out..rhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
ante Posted October 14, 2004 Report Share Posted October 14, 2004 Rhonn,Don't you have a scope?I Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted October 16, 2004 Report Share Posted October 16, 2004 Hi AnteJust want to "STEAL" some power from my serial/parallel port to power some interface using MAX232/MAX3232..rhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
ante Posted October 16, 2004 Report Share Posted October 16, 2004 Hi Rhonn,You should avoid messing with the ports like that; it can cost you the motherboard. :o Just get 5 or 12Volts inside from a free device power connector its much safer. Don Quote Link to comment Share on other sites More sharing options...
MP Posted October 16, 2004 Report Share Posted October 16, 2004 Rhonn,Is this what you are looking for? I would not try for more than 5 mA.MP Quote Link to comment Share on other sites More sharing options...
ante Posted October 16, 2004 Report Share Posted October 16, 2004 MP,The MAX232 alone consumes >=5mA at idle so this is not safe to do I think. Quote Link to comment Share on other sites More sharing options...
MP Posted October 17, 2004 Report Share Posted October 17, 2004 No, I would not use the MAX232. Use the DS275. This is the one that I use for my battery powered micro devices. Much nicer on batteries, too.MP Quote Link to comment Share on other sites More sharing options...
ante Posted October 17, 2004 Report Share Posted October 17, 2004 MP,You are correct, that Quote Link to comment Share on other sites More sharing options...
MP Posted October 17, 2004 Report Share Posted October 17, 2004 Much nicer to connect and very easy on batteries if you are powering from one. There is also a MAXxxx number which does not use the caps. It is MAX233, if looking to get away from the caps.Rhonn, maybe you can ask for some free samples of these other chips as well.I have attached the data sheet for the DS275 for anyone interested in it.MPDS275_Data_Sheet.pdf Quote Link to comment Share on other sites More sharing options...
surajbarkale Posted October 20, 2004 Report Share Posted October 20, 2004 I found a good discussion here -http://www.epanorama.net/circuits/rspower.html Quote Link to comment Share on other sites More sharing options...
Guest Kasamiko Posted October 24, 2004 Report Share Posted October 24, 2004 Things are getting complicated ;D Just to be safe..I'll used an external power source.. 8)Thanks to allrhonn ;) ;) Quote Link to comment Share on other sites More sharing options...
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