2012/1/25 andy pugh <bodge...@gmail.com>: > On 25 January 2012 21:07, Viesturs Lācis <viesturs.la...@gmail.com> wrote: > >> Kirk, I am getting totally confused... >> What is the difference in schematics between both images in Your last >> email? I cannot see any... > > The direction the arrow points in the transistor schematic symbol.
Ok, thanks! I do not understand - that is inside the BD139, right? What can I do about it, if it is still the same BD139 transistor??? I finally managed to get at least something working: Short-circuiting +5V to 4N25's pin5 turns the laser power on and off as required. I am left with an impression that 4N25 is not working correctly. Is that diode next to R1 mandatory? I will not have a time to obtain one and solder in, before going to client. I just hope that I have spare 4N25... How sensitive to soldering heat are things like 4N25 optoisolators? Maybe I have accidentally burned it? Viesturs ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! 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-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
