Don Stanley wrote: > It had not entered my mind to power the USC from the computer 12Volts. > The old "keep the noise out of the computer" mind set. But the printer cable > has already piped the USC ground into the motherboard. > If the USC input filter capacitor is able to swamp any noise from the > USC Isolated power chopper (on the new boards) that will work well > on my boards also. If it does not, a high frequency cap across the USC > power input will. > The 12 V in a computer is incredibly noisy, as it powers the spindle motors and head arms of the hard drives. If you put a scope or voltmeter on it, you'd be amazed, it will jump between 11.0 and 12.5 V when there is disk drive activity.
There is a large MLC cap right at the switching regulator input and a large aluminum electrolytic right at the power input terminals. I think you have nothing to worry about. The isolating DC-DC converter has always been there, the new switching regulator is not of the isolated type. Jon ------------------------------------------------------------------------------ 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
