Ferrite cores to use, or not to use Forums. My new Samsung plasma television PN4. E4. 50 came with three ferrite cores Todaisu HT2. S, a. k. a. ferrite rings or collars. For many years, if not decades, power amplifiers were one of the single biggest component disappointments. In fact, they had even more serious compromises than. View and Download Hypertherm HyDefinition HD3070 instruction manual online. Arc Cutting System with Automatic Gas Console. HyDefinition HD3070 Cutter pdf manual. Ferrite Core Inductor Software Definition' title='Ferrite Core Inductor Software Definition' />1. INTRODUCTION. You are at the best, free online Basic Electronics Course. Just read the brief blocks of text, view the videos, and check out some of the screened. The inverted vee does give up 3 dB at high takeoff angles. Other than the gain difference, at high angles, both antennas have basically round patterns. Instructions say I should install one on each end of power cord, providing a maximum distance from the plug at each end for core installed. But it doesnt say why I should install them, or if they sometimes might not be needed at all. A third ferrite core is provided for the antenna cable. Well, I dont have an antenna, my t. AT Ts Uverse a telephone line. Should I treat that the same as an antenna If the cores are always needed, why does Samsung leave it up to the consumers to install them, or not, and leave placement up to us as wellThe arrangement seems to imply they are either optional or sometimes unnecessary. I searched CNET forums and found several old posts but, in each case, found no real help. Maybe I misread the tone, but in one case, a reply by R. Proffitt seems to come from a someone who knew the answer but felt a snarky response was all that patshak was due. Again, sorry if I misread the tone, but if all you intend to say is figure it out yourself exact words were Think about or research what this part does., then why reply at all A follow up by patshak politely ignores the attitude, and points out that using two or more of these sometimes bulky ferrite cores, lets say on adjacent lines at a power strip or outlet, can cause crowding. Okay. but this only distracts from the original query. Are there situations when using them may do more harm than good as Proffitt implies in another answer. Perhaps ferrite cores are analogous to vitamin pills. RFI. but it they are not one size fits all. Some of us get too much calcium, or iron, for example. Ill bet using ferrite cores, like taking vitamins, can have unintended consequences. If not, why arent ferrite rings standard on every television power cord Still, I cannot find any guidance for consumers on how to determine whether or not to use one or more ferrite cores. Samsung only tells consumers where, not if, the provided cores should be installed, I found no guidance on what the do or how to know if they are optional or always helpful, or only used to address a problem after it has been detected. Does Samsung provide these ferrite cores as an afterthought, maybe instead of providing a better quality shielded power cord In one CNET forum thread on ferrite cores, Proffitt writes that ferrite cores protect your signal from the effects of a power cord spewing radio frequency interference, but doesnt say how to determine if that is actually happening, or whether ferrite cores will help or hurt in any particular situation. Another of Proffitts replies to patshak seemed to suggest using ferrite cores on an antenna cable could harm your signal quality. Deep Freeze Standard 7.20 Free Download. If I use the three ferrite cores supplied by Samsung with my plasma television to suppress RFI, could they also improve or degrade the quality or quantity of power, or the signal quality delivered by any input line to my television As an electronics technician, I make a pretty good biologist I am out of my field here. I suspect I am not the only one who would appreciate it if some helpful techie would explain the what, why, when and when not, and why not of using ferrite cores. Simply providing a link to a site that explains this would be fine. Wont someone who aced electrical engineering 1. A fieldprogrammable gate array FPGA is an integrated circuit designed to be configured by a customer or a designer after manufacturing hence fieldprogrammable. Ferrite Core Inductor Software Definition' title='Ferrite Core Inductor Software Definition' />MSC, Main Ship Equipments Equipment Types Main Marine Manufacturers. A tesla coil is a resonant air core transformer system invented by inventor Nikola Tesla in the 1890s. Originally, tesla coils were designed to broadcast. Antenna Simulation in LTspice Electronics Forums. Youll be much better off simply using the conventional radio approachthan trying to simulate everything, especially when circuit equivalentsare nebulous like this. After all, if you cant quite tell what it shouldlook like, how wouldyou know if you could implement your model once youve found asatisfactory result What kind of antenna are you looking at, loopThe first thing to knowabout a loop is, if its a very small loop Im guessing, at thisfrequency, it is, its radiation resistance is very low, meaning, you cantreat it as a nearly pure inductance Q 1. I think is typical, and itsbandwidth even with a matched load will be correspondingly narrow. The nature of the incoming signal could be modeled as a voltage or currentsource how doesnt really matter, because it isnt really either, its apower source that couples in. Again, you dont have voltage withoutcurrent and vice versa, its all about power flow, and the matching thatallows the power to flow. Since the loop is inductive, your first priority is to resonate it with acapacitor at the desired frequency. This will require a very precisevalue, and even for a single frequency, may require a variable capacitorto account for manufacturing tolerances. In the AM BCB, a Q of 1. Ferrite Core Inductor Software Definition' title='Ferrite Core Inductor Software Definition' />Hz bandwidth, so you only get a few channels for any giventuning position. And if the Q is higher, you get even fewer. Now that youve got a high Q resonant tank, you can do two things coupleinto the voltage across the capacitor, or the current through theinductor. You need only a small fraction of either, because the Q isstill going to be large. This can be arranged with a voltage dividerusually the capacitor is split into a huge hunk and a small variablepart, e. F variable 1. 0n. F, output from across the 1. F, atransformer a potential transformer across the cap, or a currenttransformer in series with the inductor, an inductive pickup the bigloop carries lots of volts, but you only need a few, so a much smallerloop can be placed inside the big loop, an impractically large inductorlike in my example circuit, which models radiation resistance as aparallel equivalent, etc. Whatever the case, you need to matchtransmission line impedance e. Once you get the signal into a transmission line, with a reasonable matchZ Zline, or alternately, SWR 1, you can do whatever you want withit. Put it into an amplifier dont forget to match it, too, etc. Yes,youre going to have funny behavior at other frequencies, and if youreconcerned about those frequencies, youll have to choose the couplingcircuit and adjustable or selectable components accordingly. Ferrite Core Inductor Software Definition' title='Ferrite Core Inductor Software Definition' />But forthe most part, you completely ignore any frequency that you arent tuningfor, usually enforcing that concept by inserting filters to reject anystragglers. Example suppose you have a loop of 5u. H and need to tune it to 5. Hz. Ithas a reactance of 1. Suppose further it has Q 2. The ESRnot counting DCR and skin effect is XL Q, or 0. EPR is XL Q, or 3. The capacitor required is 2. F. If weuse a current transformer to match to a 5. If we use a voltage transformer,its of course 8 1. C2952, 9. 691 Cband C c contact c CMACCS,Centre for Mathematical Modelling and Computer Simulation. Choosing-the-Type-of-Inductor-6-1322772215.JPG' alt='Ferrite Core Inductor Software Definition' title='Ferrite Core Inductor Software Definition' />A capacitor divider is unsuitable for resonantimpedances less than line impedance, since it can only divide theimpedance down. If the inductance were a lot larger, it could be used. To a rough approximation, a smaller inductive loop, of 18 diameter of thelarger, I think, would also work. Tim Deep Friar a very philosophical monk. Website http seventransistorlabs. Animated Cursor Pack there. On 22. 82. 01. 3 6 4. PM, Tim Williams wrote rickmanlt wrote in message news kgoo. A higher frequency would imply a smaller L andor C. How do you combine them to produce that Consider the two caps to be in series Sure. If you bring the 1. I dont have it in front of me now, in parallel with the primary. I misspoke earlier, you can safely ignore Ls, because k 1. Theres no flux which is not common to both windings. Reflecting the capacitance through the transformer changes it by the square of the turns ratio assuming the coupling coefficient is sufficiently high. I am simulating K at 1. This is also true for the inductance, but in the opposite manner. So going from the 2. In fact, in LTspice you indicate the turns ratio by setting the inductance of the two coils by this ratio. I see now that the reflected secondary capacitance is in parallel with the primary, rather than in parallel with the primary capacitor. That explains a lot. Ill have to hit the books to see how to calculate this new arrangement. I found a very similar circuit in the Radiotron Designers Handbook. In section 4. 6ivE on page 1. It need to be placed inline with the inductor. Ill have to cogitate on that a bit. Im thinking it would be properly placed inline with the capacitor in the reflection since it is essentially inline in the secondary. Either way I expect it will have little impact on the resonant frequency and I can just toss all the resistances simplifying the math. I do see one thing immediately. The null in Vcap I see is explained by the parallel resonance of the secondary cap with the secondary inductor. If you reflect that cap back to the primary in parallel with the primary inductor resonating at the same frequency it explains the null in the capacitor C1 voltage I see. C2 reflected and L1 make a parallel resonance with a high impedance dropping the primary cap current and voltage to a null. This null is calculated accurately. What I need to do is change the impedance equation from Radiotron to one indicating the voltage at Vout relative to the input signal. I think I can do that by treating the circuit as a voltage divider taking the ratio of the impedance at the input versus the impedance at the primary coil. No Inductors effectively in parallel also increase the expected resonant frequency. If you have this,. L1. UUU. Vsrc C R 3 L2. GND You might expect the resonant frequency is L2 C, but its actually L1 L2 Leq. If L1 is not substantially larger than L2, the resonant frequency will be pulled higher. I see, L1 and L2 are in parallel because the impedance of Vsrc is very low. Edge Of Disaster Am Hargrove Pdf. That is not the circuit I am simulating however. The loop of the antenna and the loop of the inductor are in series along with the primary capacitor. Im not sure what the resistor is intended to represent, perhaps transformer losses The resistance of L1 was added to the simulation model along with the resistance of the secondary coil which you have not shown. I think. It seems to me you have left out the tuning capacitor on the primary. Incidentally, dont forget to include loss components. I didnt see any explict R on the schematic. I didnt check if you set the LTSpice default parasitic ESR cap, or DCR or EPR coil on the components.