On Sunday 06 December 2015 22:57:52 Rafael wrote: > On 12/06/2015 07:25 PM, Gene Heskett wrote: > > Greetings all; > > > > Before tv's lost their crt's, there was a component in the power > > inlet circuit that had a very high negative temp coefficient, which > > was used to create a high voltage drop when it was cold, which in > > turn forced the first few seconds of its power draw after being > > turned on, thru the degaussing coils wrapped around the crt in order > > to demagnetise it. > > > > That voltage drop heated it, and it got hot enough to get down to > > just a couple of ohms, which was not enough to overcome the MOV in > > series with the coils. This also allowed the tv itself to be > > soft-started, and it worked so well that it was often the major part > > failure in the tv for the first 3 or 4 years. > > > > About 3 or 4 of those, wired in parallel, would also serve as an > > inrush limiter when I turn on the power supply for my G0704 mill. > > But the parts houses we had locally have all evaporated. I just > > checked a couple surplus places without finding any of those > > critters. > > > > Does anyone have a suggestion as to where a small handfull of these > > could be sourced? Usually bare, they look like a graphite quarter > > coin with a lead wire soldered to the middle of a silver plated dot > > in the middle of each face. Usually slightly thicker than a > > 'merican quarter. > > I think you are looking for NTC (Negative Temperature Coefficient). > Search brings back numerous links to choose from. However, there are > better solutions but cost a bit more of course.
Yes, and contrary to a previous poster, the name isn't a Surgistor, but a "Thermistor" for the NTC component. > Here is an excellent article/solution I found searching for "inrush > current limiter": > http://www.edn.com/design/analog/4316203/Simple-and-effective-inrush-c >urrent-limiter-stops-surges > Unforch, they do not seem to want to feed iceweasel the pdf. > Circuit is simple enough to implement it on a generic experimental > board. Left coast. I assume you are getting in practice at ducking behind something solid. :) Thanks Rafael. 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> ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
