EMI TG12414 Inductor

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vittoles said:
Hey guys,

On the TG 12414, the schematics i have give a Q factor resistor 1Mohm value, it's a huge BW Q factor? no?
The Q factor is dominated by the total series resistance of the inductor, including R109. Formula (good enough for an EQ) is Q=2.Pi.L.F/Rseriestotal
 
A 1Meg in an audio LC filter is probably not a Q control.

More likely a cap-pop reducer on a switch.

Q of audio inductors is usually more like 100-1K in series (may be part of the coil) or 10K+ in shunt (may be part of the boost/cut network).
 
best way is real time sweeps at different levels, inductance will change with different levels unless the core is gapped,  which is common, Ferrite pot cores are a good example of this,

there is also the Q of the core, to further confuse things, this type of Q can be changed by adjusting the gap,
 
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