2012. gada 25. Jan. 18:55 "Roland Jollivet" <[email protected]> rakstīja: > > On 25 January 2012 19:41, Kirk Wallace <[email protected]> wrote: > > > On Wed, 2012-01-25 at 17:06 +0200, Viesturs Lācis wrote: > > ... snip > > > I tested by connecting/disconnecting 4N25 pin1 to GND and measured the > > > voltage on laser power pins. > > > > Do you mean pin 2? Shorting pin 2 to ground should complete the circuit > > and push current through the opto's LED. Place regular LED in series > > with R1, just as shown for D?, but with an LED. The LED should light up > > when pin 2 is grounded. If the LED lights up the opto's LED is sure to > > light up too. > > > > > Conclusion - not working. I have 0V on output in both cases. Any > > > ideas, what might be wrong? > > > > You can try a 12 light bulb in place of the laser to see if Q1 turns ON. > > > > > Can I short-wire +5V to pin4 of 4N25 to test, if it works then? > > > > Yes. 5 or 12 Volts to pin 4 should turn Q1 ON. Be sure R2 is in between > > your short and Q1. If this works, replace U1, it might be defective. > > > > > That > > > way I intend to check, if 4N25 is good or no. > > > > > > Viesturs > > > > See attached schematic. The . is hard to see so the "6 V" are really .6 > > V. The voltages are approximate. > > -- > > > > > By the way, you are using a PNP package for a NPN device. Be sure to > change it before doing a layout. >
I kind of understand the difference, but do not get, how it relates to me. Could You please explain in more detail? 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
