2012/1/27 gene heskett <ghesk...@wdtv.com>: > > Is there perchance an adjustment potentiometer? The LM317T is a linear > regulator device and could be made adjustable so as to compensate for the > wiring and switching loss in your controller. >
Nope, I see 2 resistors in series for the middle leg. > > I'm sorry. I try to describe things in understandable terms and obviously > I didn't bridge the gap very well. > I think that You did pretty well, it is just thatI do not get that pretty well :) > > That very thin wire will probably need replaced with something heavier > while maintaining flexibility for long life. Or perhaps the LM317T needs > turned up a few hundred millivolts. See the sample schematic shown here: > > <http://www.national.com/mpf/LM/LM317.html#Overview> > > Perhaps the maker used a fixed resistor in place of R2, the adjustable one? > Given parts tolerances it could already be borderline low. > Given that 20-100 millisecond response time probably won't be a show > stopper, another thought that may be easier for you to fab on site would be > to use your controller circuit to switch a relay. That, and heavier wire > might be the better method as opposed to turning the supply up .250 > additional volts because someone may replace a future broken cable with an > even heavier one which would let the magic smoke out of the laser. I looked carefully and it looks to me that there are 2 resistors in series, where is R1 in that scheme and that connection to GND through R2 - I do not see that. Ok, I think I have to explain one thing that was missed and seems to be misunderstood: I do not want to detach laser board from the laser itself - they are connected with ~40cm of wire and I would like to keep it that way. That thin wire is between my diy driver and the laser board. So I will try to figure out, how to replace the wire. ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
