On Wednesday 28 December 2016 17:42:29 John Thornton wrote: > Hi Gene, > > Want to test one of my 5v 3a regulated power supplies? > > JT
A linear I'd assume. Details @url? This one? http://mesaus.com/index.php?route=product/product&path=67&product_id=73 Thats not a linear. At that $$, I can afford to "test" it, but your web page doesn't like my FF, so I am stuck at the checkout steps display but its all DIW from here. I'll call tomorrow and pass the card nums. > > On 12/28/2016 4:33 PM, Gene Heskett wrote: > > Greetings everybody; > > > > Now I am asking a question that I should know the answer to. > > > > It looks like, from the evidence so far, that this 5v 4a little > > switchmode psu should be sent to the fcc and let them ban it from > > ever coming off the boat or airplane on US soil. > > > > Its "static" ground terminal is common to the case, and I have now > > grounded it by way of a couple flat braided ground straps about > > 5/16" inch wide, back to the ground bolt in the bottom of the box. > > Ditto the static ground on the z motors 60 volt psu. House static > > coming in is now also bolted at that stud. The scope probes ground > > lead is on that stud, the clipon probe is clipped to one of the > > ioconnectors ground pins. > > > > That point is bouncing around 2.5v p-p with the switching activity > > in that psu. That bolt s/b common to the lathes bed casting thru > > the bolts that mount it on a post bolted to the chip pan, which is > > braced by an angle iron bolted to this post, with the end of the > > angle, about 8" away, bolted solidly to the bed casting at the other > > end. > > > > I purposely did not connect anything in the at667 encoder wireup, to > > the frame anyplace. If I could find a good, real dirt ground for > > the scope probe, I take bets that the whole latch is bouncing at > > least 25 volts p-p to that real ground. > > > > The only way I can see ATM, is to install some "longitudinal" > > filters, therefore chokeing that noise back into the psu instead of > > giving it something to work against in the form of a solid > > connection to the powerline. I can source such a filter from Dave > > at the tv station as I know he has a pile of failed monitor pcb's, > > all of which will have good filters we can excavate. > > > > Or should I take the chance that the next one I buy on fleabay, > > would be quiet? Your call. > > > > > > Cheers, Gene Heskett > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
