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Ravaner
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Hello. Just a basic question : is there any difference ( Q, parasitic capcitance ... ) between molded inductors and air inductors turned by hand. Let say for instance for values in order of 1 µH ?
Yes.Ravaner said:Hello. Just a basic question : is there any difference ( Q, parasitic capcitance ... ) between molded inductors and air inductors turned by hand. Let say for instance for values in order of 1 µH ?
You may find that an air cored inductor is large by today's standards if a good Q is to be obtained. And I expect you will also want it in a shielding can, which will exaggerate the size. A ferrite core will increase the Q for a given size.Ravaner said:Hello. Just a basic question : is there any difference ( Q, parasitic capcitance ... ) between molded inductors and air inductors turned by hand. Let say for instance for values in order of 1 µH ?
No. And exactly that's the problem - the difference in behavior is not predictable. Those hand made coils in tuners and such are not just hand made, but individually fine-tuned after assembly. With machine made coils what you get is already sorted, values and parameters are guaranteed, you just pick them, put them on the PCB and it'll work within the known limits.Ravaner said:I don't really understand your reply. Assume my circuit is supposed to run at 50 MHz ( an amplifier or oscillator ... no matter)
I may wound a coil working in air or used a molded inductor. Except problems relative to room, is there a predictable difference of behaviour.
Molded inductors are created using a molding process where the inductor is encased in a plastic material, while air-turned inductors have a coil wound around a core made of air or a non-magnetic material.
Air-turned inductors are generally more efficient than molded inductors. This is because they have lower resistance, which results in less energy loss.
Molded inductors are less expensive to manufacture and can be made in smaller sizes compared to air-turned inductors. They are also more resistant to physical damage due to the protective plastic casing.
Molded inductors are often used in low frequency applications such as power supplies, audio equipment, and consumer electronics.
Air-turned inductors are commonly used in high frequency applications such as radio frequency circuits, telecommunications, and wireless devices.