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. When I was setting up the mill, and building that supply, I had wired up a 4 plex on the wall behind it, putting it by itself on a 20 amp breaker. Turning it on, trips the 20 instantly as the motor supply has a huge amount of microfarads, probably in excess of 80,000 uf, mainly because that was the size of the caps I could source, NOS, locally by the fine old art of horse trading. So, while it draws less than 3 amps with the spindle motor off, and could reach 18 if the motor was in a LR state, but it takes a 30 amp breaker to withstand the in-rush. If I could find some of these critters, building them into that motor supply, I could put the 20 amp breaker back in and it wouldn't be quite so ill eagle if an inspector looked it over. 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
