Transformer insulateing tape?
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From: Martin Riddle on 21 Jun 2010 21:49 "Bill Sloman" <bill.sloman(a)ieee.org> wrote in message news:aaebfcd1-3f60-43db-95e2-feca66b0b1e1(a)t10g2000yqg.googlegroups.com... > On Jun 19, 6:50 pm, Hammy <s...(a)spam.com> wrote: >> What kind of tape can you use for insulation between primary to >> secondary of flyback transformer. I know mass produced professional >> designs use a 3M specialty tape. What I'm looking for is a tape I >> could pick up at Staples or some office supply store or hardware >> store. >> >> The vinyl electrical tape I can find is only rated for 600V and 80C >> MAX TEMP. >> >> Is there a commonly available tape that is good for higher temp and >> offers higher insulation? I've read of people using a mylar tape is >> there a brand name ,type anyone could recommend? >> >> This is for a 90 - 140Vac input flyback. > > As has been mentioned here, 3M's yellow polyester film is popular. > > Farnell/Newark stocks it in three widths - 12mm, 19mm and 25mm. You > can order a sinle 66 metre roll for a couple of dollars. The Farnell > order codes are 726-977, 753-002 and 753-014. > > If I remember rightly, the tape is 60 micron thick. > Mouser has the Yellow Polyester thermosetting tape, not the same as the pressure adhesive, buts sets when baked. <http://www.mouser.com/Tools-Supplies/Tapes-Mastics/_/N-wp6v?P=1z0xh4z&Keyword=tape&FS=True> Cheers
From: DrParnassus on 21 Jun 2010 22:01 On Mon, 21 Jun 2010 18:06:40 -0700 (PDT), Bill Slotard <bill.slotard(a)ieee.org> wrote: > >American woodworkers might now use it because they buy American >machine tools. Traditional woodworkers - like my great-grandfather and >his brothers - never used mils. They do not use inches either, idiot. Only a group of peoples that DO use inches would use mils regularly. The fact that the rest of the world does is related more to military base proliferation and the industries behind that and other American products made elsewhere meant that it became of worldwide use in certain scenarios. Face it, Slotard, you have failed to make a single valid point about systems of measure, and if anything at all is true in this world, it is that YOU are the one that is obsolete. ieee should kill your subscription.
From: DrParnassus on 21 Jun 2010 22:07 On Mon, 21 Jun 2010 18:06:40 -0700 (PDT), Bill Sloman <bill.sloman(a)ieee.org> wrote: > >Only if you ignore non-electronic vernier calipers, screw micrometers >and the like. You seem to have the idea that manufacturing industry >buys new, "modern" tools as soon as they are advertised, and >discarding everything else as old-fashioned. You're an idiot. Non-electronic verniers generally only have room for ONE scale, and most bought inch and metric versions back in the days before electronic resolve. Simple hand rules are nearly ALWAYS doubly scaled. If you were any more retarded, I'd swear that you were a clone of Rosie O'Retard.
From: DrParnassus on 21 Jun 2010 22:11 On Mon, 21 Jun 2010 18:06:40 -0700 (PDT), Bill Sloman <bill.sloman(a)ieee.org> wrote: >Mixing units is stupid. No, you are stupid. > At least one of your interplanetary probes >failed because of a units mix-up. Maybe it was a failure to mark it well enough, but the unit was made under all one system of measure. The mistake was operator level, not machine level, you retarded twit!� He filled x Lbs, when he should have filled x kg. That resulted in less than half the needed fill.
From: JosephKK on 22 Jun 2010 01:21
On Sun, 20 Jun 2010 14:30:19 -0700 (PDT), Wimpie <wimabctel(a)tetech.nl> wrote: >On 20 jun, 21:19, Perenis <Pere...(a)hereforlongtime.org> wrote: >> On Sun, 20 Jun 2010 11:53:29 -0700 (PDT), Wimpie <wimabc...(a)tetech.nl> >> wrote: >> >> >He mentions it is line-powered, >> >> The UNIT is, not the transformer. >> >Words from Hammy: "Just one. I'm using an ETD29 core with Bobbin. I've >made several >transformers for LVDC less then 50Vrms.This is my first transformer >from scratch for a line powered supply." > >Did I understand this wrong, no mains powered circuit? > > >> I would feel reasonably sure that the hammster does not need to worry >> about his AC flashing through to the operator. Andif it doe, he'll trash >> it and build another. >> >> > so you have to account for over >> >voltages and whether single or double/reinforced insulation is >> >requried, even when the output voltage is 5V. If Hammy doesn't have EN >> >60950, or 60065 at hand, he may search for ECMA-287. >> >> He has stated SEVERAL times that this is NOT a product! > >Even when it isn't a product, you want a safe setup. > >> >> > It can be >> >downloaded free and gives good guidance on creepage, clearance, >> >insulation requirements, etc. >> >> He knows about that already. SO DO I. The only difference is that *I* >> DID read the thread, and *I* DO know what his considerations for this >> are. It is for his personal lab. > >If he knows that (safety issues) already, why asking for what tape to >use? > Reading the thread is seems to Hammy is more asking for a source for the right tape. (And definitive reasons why the wrong tape is wrong.) >> >> First, he wants quick and dirty to prove the design. Then, he MIGHT >> fine tune it, characterize it, or 'dial-it-in'. If it works right on the >> first jab, he might just be done with it and get back to his other bench >> work. > >Wim > >PA3DJS >www.tetech.nl |