On Sunday 31 January 2016 13:43:50 Jon Elson wrote: > On 01/31/2016 08:50 AM, Gene Heskett wrote: > > The cro-magnun filling the order has no clue about the care and > > feeding of mosfet transistors, so the 10 pack I ordered were > > arranged as 2 rows of 5, with the legs interdigitated, bound in > > scotch tape as a slab to fit nicely in a China Post envelope. > > I can't imagine why you'd buy commodity semis from a Chinese > source when there are great distributors like Digi-Key and > Mouser, that are quite happy to serve small orders. I buy > lots of batches of 10 of some part when I'm not sure it will > work for a particular application. I can usually get my > parts in 2-3 days. > Both of the above have minimum orders for me that are quite costly for a 10 pak of anything in the transistor 10 cent to 5 dollar price range. That and their sites search engines return what looks to me to be random from dice throws results. If I go searching for small hexfets I get 20,000 hits, none of which give me the data to make a choice semi-intelligently. Digikey is slightly better, but not enough to spend hours wading thru the selections while still hiding the important data. More often than not, clicking on a fine tune option, such as any case smaller than a to-220 returns zero results and I know that there are smaller versions such as could drive an ice cube relay at 12 or 24 volts. That can be easily put in a to-92, or even in a SMD package, so why can't it be found?
> (The only place Digi-Key annoys me is if I buy 50 or less > FPGAs or CPLDs from them, they repackage them in strips of 5 > chips in tapes, rather than giving me the whole tape in one > long strip. These don't feed well in my pick and place > machine.) > > Sometimes they also pile delicate components in an > anti-static bag, and the leads get a bit bent up, but that > is pretty rare. > > Jon FATCare's the controller and motor, once wired up and powered up, runs just fine. I left it running, no load, at 12k revs (200 Hz) for about 20 minutes, might have warmed up the motor by 10F, tested the fwd/rev & back, and other than the rate ramps being slow even set for 10 seconds, OOB setting was 45 seconds, it Just Works(TM). Even at 24k revs, the noise level was quite a bit lower than I expected. Rotor balanceing is excellent. The booklet describes braking resistors and what terminals to wire them to, but on opening up the rest of the front panel & removing the control pcb, no hint of those named terminals could be found on the main board. There is a place where a bigger, taller electrlytic cap could be installed, but I get the impression its not needed when running on a 250 volt single phase circuit. I cleared the ebay ticket. 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> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
