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These toroids are particulary suitable for high power or for big size chokes.
Here follows an example of power HF - VHF transformer.
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Jumper small pipes made of copper or brass which is the 12.5 Ω impedance side |
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Typical application as transformer for HF input or output | ![]() |
Mounting example |
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P.C.B. to keep togheter the ferrites |
There are also available silver plated unipolar wires with teflon insulation useful to build inductances and transformers on toroids, see dedicated section.
See the below PDF for an interesting example of construction of HF power transformer.
Order code: | TF-94 |
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Round cable ferrite bead |
Conditions: | N (The product is brand new) |
Permeability (µi): | 850 |
Outer diameter (metric): | 12.3 mm |
Inner diameter (metric): | 4.9 mm |
Length (metric): | 25.4 mm |
Outer diameter (imperial): | 0.484 in |
Inner diameter (imperial): | 0.193 in |
Length (imperial): | 1 in |
Order code: | TF-97 |
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Round cable ferrite bead |
Conditions: | N (The product is brand new) |
Permeability (µi): | 500 |
Outer diameter (metric): | 12 mm |
Inner diameter (metric): | 5.1 mm |
Length (metric): | 25.4 mm |
Outer diameter (imperial): | 0.472 in |
Inner diameter (imperial): | 0.201 in |
Length (imperial): | 1 in |
Order code: | TF-98 |
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Round cable ferrite bead |
Conditions: | N (The product is brand new) |
Material: | 43 |
Permeability (µi): | 800 |
Min. impedance (Ohm @ Freq.): | 105 Ohm @ 10 MHz, 171 Ohm @ 25 MHz, 250 Ohm @ 100 MHz, 255 Ohm @ 250 MHz |
Outer diameter (metric): | 14.3 mm |
Inner diameter (metric): | 6.35 mm |
Length (metric): | 28.6 mm |
Outer diameter (imperial): | 0.562 in |
Inner diameter (imperial): | 0.25 in |
Length (imperial): | 1.125 in |
Order code: | TF-99 |
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Round cable ferrite bead KE KITAGAWA K5A RH 26X13X28 |
Conditions: | N (The product is brand new) |
Permeability (µi): | 500 |
Min. impedance (Ohm @ Freq.): | 80 Ohm @ 25 MHz, 150 Ohm @ 100 MHz |
Outer diameter (metric): | 26 mm |
Inner diameter (metric): | 13 mm |
Length (metric): | 28 mm |
Outer diameter (imperial): | 1.02 in |
Inner diameter (imperial): | 0.512 in |
Length (imperial): | 1.102 in |