At 02:52 PM 2/11/2007, kd5nwa wrote: >Remember "computers are evil" they are out to get us. The very design >of the PC is nothing but trouble, some are so poorly designed that >current for the power flows through the chassis
I doubt they're actually designed to do this intentionally, but it's not unusual for someone to mount a mother board with a metallic standoff that shorts to a ground trace, rather than the usual nylon snap in doo-hickeys... Not all holes in the motherboard are intended for screws (if any)... And then, there's the problem with the grounding of the PSU, since the 5V return carries a fair amount of current. If you have a disk drive that, for instance, bonds the drive chassis and the 5V return, and then the chassis gets bolted with a hard connection (as opposed to little plastic shock mounts), it provides an alternate path (maybe... depends on if the PSU bonds the return at it's chassis), and, of course, there's all the digital signal returns in the cable to the disk drive anyway (hey.. there's a good reason for Serial ATA... it uses LVDS balanced signalling, as far as I know). Hardly an optimum design for analog signal processing, in any case. Jim, W6RMK _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com/ FlexRadio Knowledge Base: http://kb.flex-radio.com/
