On Sun, 19 Sep 2010 12:00:30 -0400, you wrote:
>Some of the CNC4PC boards are almost unmountable.. I think he leaves >out the holes to minimize the board space and the cost.. But I sure >wish he would add in a half square inch of extra board space for holes! All the CNC4PC boards I've tested have been lacking in design (mounting) and performance using old legacy components. I'm not singling Arturo out here, most breakout board purveyors (I chose that word carefully) have not progressed past designs that can operate at much better than multiple uS switching rates. I've seen current production opto isolated boards still using CNY75B optos. It takes that opto 4.5uS to turn off, and 5uS to turn on again, think about that with pulses that may have to be 5uS long, there's little or no headroom before lost pulses at even 25kHz. Even Mach can output 100kHz on a parallel port with a fast PC! Mounting is the least of your problems when the basic unit is poor. Steve Blackmore -- ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
