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<br>
<b><u>Notes:</u></b><br>
RF Toroid Calculator was developed to help users predict the RF characteristics of a ferrite toroid wound as an inductor.
It uses the manufacturer's (Fair-Rite) published data including the toroid's dimensions and complex permeability characteristics.<br><br>
It uses the manufacturer's (Fair-Rite) published data including the toroid's dimensions and complex permeability characteristics.<br>
The calculator has 4 separate display areas. At the top is the chart display for showing frequency-dependent characteristics. Next is the
schematic display, where a scaled image of the toroid and windings is presented to help with intuitive design. Next is the control panel
section, where the user can select the toroid material, toroid size, wire size, number of windings and excitation voltage.
section, where the user can select the toroid material, toroid size, wire size, number of windings and excitation voltage.<br><br>
<u>Inputs via the select widgets:</u>
<ul>
<li>Application : Inductor is the only application currently supported.</li>
<li>Size : Selects the size of the toroid. FT240 is 2.4" in diameter. FT80 is 0.8", etc...</li>
<li>Material : Manufacturers material mix code, with initial permeability [&#956;i] in square brackets. Pick lower &#956;i for higher frequency applications.</li>
</ul>
<u>Inputs via the slider widgets:</u>
<ul>
<li>AWG : Select the wire gauge. Sliding L-R changes AWG from 40-0. (Defaults to 20 AWG)</li>
@ -77,10 +83,9 @@
<li>Vrms : The RMS voltage applied to the inductor (Volts). Determines the flux-density (B) and field-intensity (H) within the ferrite toroid. (Defaults to 10Vrms)</li>
<li>f : Shifts the frequency of interest of the chart display from left-to-right. Left towards kHz, right towards GHz. </li>
</ul>
<p>Characteristics on the left are independent of frequency, while the characteristics on the right are dependent on the selected frequency. <br><br>
Each of the graphic representations attempt to keep the relative geometry correct, without exceeding the drawing boundary. The coil diameter
relative to the conductor diameter are representative. </p>
<i>Note: Manufacturers recommend keeping the number of turns (N) to a minimum.</i><br><br>
<u>Chart display:</u>
The chart title contains manufacturer, size, material and part number of the device. <br>
Calculated parameters are displayed against frequency (log scale). Each parameter may be displayed or hidden
by tapping on the legend key. Tapping on a data point will display the parameters for a single frequency.
<ul>
@ -90,13 +95,14 @@
<li> Q : Quality factor. </li>
<li> I(mA) : RMS current in milliamps. (Hidden by default.) </li>
<li> &#956;' : Complex permeability - reactive part. (Hidden by default.) </li>
<li> &#956;'' : Complex permeability - resistance part. (Hidden by default.) </li>
<li> &#956;'' : Complex permeability - resistive part. (Hidden by default.) </li>
<li> H(Oe) : Core field intensity in Oersted. (Hidden by default.) </li>
<li> B(G) : Core flux density in Gauss. (Hidden by default.) </li>
<li> P(mW) : Power dissipation in milliwatts. </li>
</ul>
<i>Note: To use as an inductor, avoid using where Q is small or less than 1. When Q is less than 1, core loss energy is higher than magnetisation energy.</i><br><br>
<u>Schematic display:</u>
Scaled representation of the toroid and the windings. Wire gauge and toroid dimensions are provided.
Scaled representation of the toroid and the windings. Wire gauge and toroid dimensions are provided.<br>
On the left of the display are the following:
<ul>
<li>L : Inductance in microhenries.</li>