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Re: When is a coil not a coil?

hey brian,

let me play devils advocate here for a minute.

At frequencies where these tubes might oscillate, these ferrite beads look like small resistors more than like inductors

I have seen this argument made and i'm not sure i buy it for this particular situation.

think worst case and 100% losses in the core, you still have an air cored inductor which decidedly is not resistive at some arbitrarily high frequency.

That's due to intentional losses in the core.

core losses model as a resistor in parallel with the inductance and this is in series with the DCR. Think of it this way, can you ever add a core to an air cored inductor and reduce the inductance?

dave


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