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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Re: can you ever add a core to an air cored inductor" posted by dave slagle on January 30, 2007 at 08:36:13:
Got ferrite on the mind, huh Dave? ;)I think that you really need to add a series resistance component. See the Murata paper I provided a link for earlier. It shows a series R-L. A lot of times, the ferrite bead works fine with just a straight wire though the core (no wrapped turns). Technically, this is still one turn. The ferrite might slightly magnify the inductance, but it adds a series resitance component that we desire. Technically, it converts AC grid currents into miniscule amounts of heat. In fact, according to Murata, the resitance becomes larger than the inductive reactance over a useable range of high frequencies. Remember, this is a non-linear frequency-variable resitance - a real mind-twister that's impossible to model with a few linear components. Eventually, at even higher frequencies, the shunt capacitance rears its ugly head, but then we hope that the feedback loop gain from plate to grid is below unity and no oscillation would occur way up there (maybe not always true). Is this helpful?
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- Re: can you ever add a core to an air cored inductor" - BBeck 08:52:28 01/30/07 (0)
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