Gene, Does your Mean Well have "Made in China" wrote on it?
My 24V - 20A Taiwan labeled Mean Well's were pulled from industrial equipment, and work quite well. The 12V - 20 A Chinese labeled one, that I bought last year off of Ebay, lost it's magic smoke after a week of intermittent use at 8A. Due to their popularity, I'm assuming that there are quite a few fake Mean Well PSU's on Ebay. On 12/28/2016 11:54 PM, Gene Heskett wrote: > On Wednesday 28 December 2016 23:49:00 Danny Miller wrote: > >> 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-S >> upply-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:nssAAOSw >> A3dYGUnC >> >> Meanwell isn't even notably more expensive. >> >> Danny >> > This noise maker is in fact a Meanwell I bought from MPJA. But if I still > had a good am radio, I could set up a df loop, I'd bet I could find it > every 17 kilohertz to at least 75 megahertz! This has ringing components > that exceed the vertical bandwidth of my Hitachi V-1065, rated at 100 > mhz, but I have actually used it to look at the driver stage output of a > 50 kw tv transmitter on channel 8, which is nominally 180 megahertz. > > Scrounging around in my junk box, I found a computer psu that I > had "borrowed" a power hexfet out of several years ago, and its line > input filter was actually on a separate PCB, so it was quite easily > clipped out of the circuit. Looks like a 5 pole push pull Chebychev > design. I'd have to make a box for it if I use it, but I can put it in > circuit for S&G's in about 15 minutes tomorrow as a test. Noise coming > back in on the supposedly grounded and shielded cable to the encoder in > the lathe, about 8 feed of cable, is 1.95 v p-p on the 7i90 input > connectors ground pin. > > With all that running on 5.09 volts, and feeding a 3.3v circuit on the > pi, there simply is no way in hell thats not going to putz with the data > integrity. And its doing a great job of that. > > So we'll see what this filter does to it tomorrow. In the meantime, I'll > have JT send me one of his for "testing". USPS can probably have it in > my mailbox by Monday from his place. > -- MC Cason Eagle3D - Created by Matthias Weißer github.com/mcason/Eagle3D ------------------------------------------------------------------------------ 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
