| Core Category |
1. Iron Powder Cores |
2. Medium Ferrite Cores |
3. Strong Ferrite Cores |
| "Strength" |
Tea |
Cappuccino |
Espresso |
| Permeability (μ) |
μ = 3
- 20 |
μ = 100 - 1500 |
μ = 1500 - 10000 |
| Loss in HF |
Low loss |
Medium loss |
High loss |
| Photo examples |
Typically colored Amidon and Micrometals Eg. materials 6 and 2 |
Typically NiZn or (MnZn) black/grey Amidon and Fair-rite Eg. materials 61, 43 and 31 |
Typically (MnZn) black Amidon and Fair-rite Eg. material 31 |
| HF application |
Tuned circuit Low-pass filter Inductor for tuner |
Common mode (current) balun Wide band RF transformer Voltage balun |
Interference filters for AC/DC power lines in switched power supplies, inverters and all kinds of IT lines |
The important parameter is the permeability of a core to minimize RF losses in tuned circuits, baluns, transformers
and to maximize the loss in interference filters. Refer to the manufacturer data sheet for the material permeability.
Iron powder cores Amidon | Micrometals
Ferrites Amidon | Fair-rite
2018-11-25 OH7SV
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