I can tell you this with confidence- the reliable, quality brand is "Meanwell".
They all look pretty much the same, they're not. http://www.ebay.com/itm/Mean-Well-MW-5V-3A-15W-AC-DC-Switching-Power-Supply-NES-15-5-/351760561983?hash=item51e690373f:g:NbMAAOSwepJXYhR4 http://www.ebay.com/itm/GENUINE-MEAN-WELL-POWER-SUPPLY-ADAPTER-ES18A05-050-5V-3A-15W-max-100240v-/112229820233?hash=item1a216b2749:g:nssAAOSwA3dYGUnC Meanwell isn't even notably more expensive. Danny On 12/28/2016 4:42 PM, John Thornton wrote: > Hi Gene, > > Want to test one of my 5v 3a regulated power supplies? > > JT > > > 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 > ------------------------------------------------------------------------------ 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
