Transformer insulateing tape?
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From: Hammy on 20 Jun 2010 19:52 On Sat, 19 Jun 2010 12:50:40 -0400, Hammy <spam(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. Thanks everyone for your input. I didnt mean to start a flame war;-) I'm just going to dig through the pile of junk I have as was suggested, and see if I cant work something out for the time being. My next order to Newark will include the tape.
From: Bill Sloman on 20 Jun 2010 20:02 On Jun 20, 6:51 pm, "k...(a)att.bizzzzzzzzzzzz" <k...(a)att.bizzzzzzzzzzzz> wrote: > On Sun, 20 Jun 2010 08:43:34 -0700 (PDT),Bill Sloman<bill.slo...(a)ieee.org> > wrote: > > > > >On Jun 20, 5:25 pm, Fred Abse <excretatau...(a)invalid.invalid> wrote: > >> On Sat, 19 Jun 2010 20:08:16 -0700,Bill Slomanwrote: > >> > The electronics industry is infested with dimensions expressed in > >> > bizarre fractions of an inch > > >> Commonly: > >> 0.1 > >> 0.05 > >> 0.001 > > >> This must be a usage of the word "bizarre" with which I am as yet > >> unfamiliar. > > >As an occasional woodworker, I understand half inch and quarter inch > >thicknesses, and I've used veneer that was just one sixty-fourth of an > >inch thick. Decimal divisions of the inch strike me as odd - if you > >want to use decimal arithmetic, metric units make a lot more sense. > > SLowman, stupid as ever. The 'mil' is a quite standard unit of measure, and > yes, it's used by woodworkers, too. The mil is still a standard unit of measurement in the US, whose engineers failed to keep up with the rest of the world when it went metric. Your scientists weren't as backward. I'm happy to use any unit that works - furlongs per fortnight come to mind - and most of my Ph.D. thesis reports my results in the concentration unit of "torr at 298.15K" which happened to be convenient (as I was measuring out my gases by filling known volumes to pressures monitored mostly by a mercury manometer, sometimes by a diallyl phthalate manometer). It could be - and was - converted to the more conventional moles per litre by dividing by 1.8593x10^4. I'm not so stupid as to expect other people to be able to rapidly process idiosyncratic units. Equipping an entire manufacturing industry with tools that measure in terms of fractions of an inch while the rest of the world uses fractions of a metre reflects exactly that kind of stupid expectation - the engineers of God's Only Country didn't think that their tools and products might be exported to other countries, and couldn't imagine that they might want to import tools and products from the rest of the world. That was stupid, arrogant and expensive. It will cost you a bundle to retool as the British did, some fifty years ago, back when the tools were simpler and cheaper and somewhat thinner on the ground. -- Bill Sloman, Nijmegen
From: Perenis on 20 Jun 2010 20:02 On Sun, 20 Jun 2010 14:30:19 -0700 (PDT), Wimpie <wimabctel(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? > Mains front end. NOT a mains transformer.
From: Perenis on 20 Jun 2010 20:03 On Sun, 20 Jun 2010 14:30:19 -0700 (PDT), Wimpie <wimabctel(a)tetech.nl> wrote: >> � He has stated SEVERAL times that this is NOT a product! > >Even when it isn't a product, you want a safe setup. > Yes, but overkill is overkill, and if I practiced it, this group would be sparsely populated.
From: DrParnassus on 20 Jun 2010 22:32
On Sun, 20 Jun 2010 19:52:31 -0400, Hammy <spam(a)spam.com> wrote: >On Sat, 19 Jun 2010 12:50:40 -0400, Hammy <spam(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. > >Thanks everyone for your input. > >I didnt mean to start a flame war;-) > >I'm just going to dig through the pile of junk I have as was >suggested, and see if I cant work something out for the time being. > >My next order to Newark will include the tape. Somebody said e-bay. It would seem that if you do find one there, it would be cheaper. The stuff does age poorly though. Only good for about 6 years, then the adhesive pukes on the premium stuff. The gooey adhesive stuff lasts longer. Funny thing with the 3M stuff is that the tape is not what makes it yellow, the adhesive is, and if it comes off, the tape is perfectly clear. |