On Friday, January 27, 2012 02:29:30 PM Viesturs Lācis did opine: > 2012/1/27 gene heskett <[email protected]>: > > That depends. Can, if you just short your device, burn wood? If not, > > or only very much slower than you expected, then the wire is too > > small. > > I could. Now it seems that my diy stopped working again - laser > receives ~3V DC regardless of the state of gpio output pin. > > I give up trying to get it working. > > > However, this gives me another better idea, that of putting your DIY > > switching device right at the laser, essentially doing away with the > > wiring losses, and use the existing small wire going to it for the > > logic signal to control it. > > > > That seems like the most serviceable solution to me, quit trying to > > send the amps up and down a small wire, just send the controlling > > signal. I am assuming that the relatively small currents your DIY > > needs can be supplied by the lasers own supply, removing the need to > > also send your DIY a pair of power leads of its own. > > Thanks, sounds like a pretty good idea. Its only downside - I cannot > implement it on the spot at client's site, because I have to redo my > diy - it is on the same piece of pcb with 7 input optoisolators for > home, limits and e-stop. > Ouch, but that could probably be tossed together in a couple of hours on a perf board about 2" square from the shack, hopefully where you are there is a similar hobby store with that stuff?
> 2012/1/27 gene heskett <[email protected]>: > > On Friday, January 27, 2012 01:50:53 PM Kirk Wallace did opine: > >> I suspect the power to the laser driver just needs to be switched as > >> an Enable, with the driver's TTL input modulated by PWM/PDM to turn > >> the bean on and control the strength. > >> > >> I have zero experience with lasers, so grains of salt are > >> recommended. > > > > And I suspect you are spot on, and that we have managed to make a > > larger problem out of it than it is. > > As I wrote - there are only 2 connection terminals for laser board, > labeled "+" and "-" > > Viesturs > > ------------------------------------------------------------------------ > ------ Try before you buy = See our experts in action! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-dev2 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Genius is one percent inspiration and ninety-nine percent perspiration. -- Thomas Alva Edison ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
