Ed, do you know how stable the voltage remains across a range of loads from open to dead short? Curbside microwaves and some heavy gauge wire sounds a whole lot cheaper than commercially produced transformers. 1KW at 13.5V +/- 1.5V could come in handy, but not handy enough for my budget to justify a commercially available solution. I also read that transformers are put under more stress when the secondaries are rectified. I'll need to do some more reading on this as well.
One last question... any reason this tecnique couldn't be used for higher voltages on the secondaries? Like around 140 to 165V? (Assuming secondary winding's insulation is adequate) I'm thinking that transformer isolation might be safer than running on rectified 110. Thanks for the food for my thoughts Jim Coleman On Dec 30, 2011 1:56 PM, "gene heskett" <ghesk...@wdtv.com> wrote: > > On Friday, December 30, 2011 01:42:36 PM Ed Nisley did opine: > > > On Thu, 2011-12-29 at 21:14 -0500, gene heskett wrote: > > > pointers to the articles > > > > That was a series on transformers & triac triggering, with a resistance > > soldering setup as the McGuffin. CC doesn't put articles online (if you > > know where to look, go for April/June/August 2008), but I put up some > > notes a while ago; start at the first post and rummage through the next > > few days: > > > > http://softsolder.com/2010/09/07/resistance-soldering-gizmo-overview/ > > > > The transformer notes, complete with a B-H curve, may be most useful: > > > > http://softsolder.com/2010/09/08/resistance-soldering-transformer/ > > > > The triac trigger circuitry was *insanely* complex, because I wanted to > > show what happens during four-quadrant triggering with sub-cycle > > control. In real life, you'd just fire a triac driver for the entire > > heating pulse and be done with it. > > > > A while back, Eks forced me to take his homebrew water-cooled pulser > > built around a stack of hockey-puck transistors that he'd been using for > > EDM. All I need is a bulk supply behind the thing, a bit of Z axis > > control, and I could sink dies with the best of 'em... [sigh] > > Chuckle, thanks for copying the mail Ed. But that last one will need some > very good earmuffs, 30db or better if you intend to be in the same building > with it. Of course I had a whole 10" circular saw blade on the table, > which predictably rang like the bells hell most likely uses for an escape > alarm bell. I also was using too big a cap (10 mics, 600 volt, its what > was on the shelf for spares for a 55 yo GE transmitter & I wasn't being too > fussy about whose junkbox shelf I was raiding given that transmitters > limited 45 day future in mid-May of 2008) :) > > Cheers, Gene > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > My web page: <http://coyoteden.dyndns-free.com:85/gene> > Real programmers don't bring brown-bag lunches. If the vending machine > doesn't sell it, they don't eat it. Vending machines don't sell quiche. > > ------------------------------------------------------------------------------ > Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex > infrastructure or vast IT resources to deliver seamless, secure access to > virtual desktops. With this all-in-one solution, easily deploy virtual > desktops for less than the cost of PCs and save 60% on VDI infrastructure > costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
