On 12/06/2015 10:42 PM, Gene Heskett wrote: > 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. Digi-Key has them, but maybe not in a current you want. http://www.digikey.com/product-search/en/circuit-protection/inrush-current-limiters-icl/656273?k=ntc%20thermistor
Here's more : http://www.digikey.com/product-search/en/sensors-transducers/thermistors-ntc/1966148?k=ntc%20thermistor > Jon ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
