12-03-2013, 05:57 PM
Hi Joe,
I reckon that's 260uH, which seems a bit more plausible.
The reactance of an inductor, XL, is given by 2 pi times F times L
In the filter above, we get the -3dB point when XL is equal to the R. Note that it's -3dB, not -6dB, because of the phase angle.
So, at the -3dB point, we know that XL equals 1000, so it's just a case of rearranging to find L. Or, L = 1000 / (2 pi times F)
Hopefully this makes sense,
Mark
I reckon that's 260uH, which seems a bit more plausible.
The reactance of an inductor, XL, is given by 2 pi times F times L
In the filter above, we get the -3dB point when XL is equal to the R. Note that it's -3dB, not -6dB, because of the phase angle.
So, at the -3dB point, we know that XL equals 1000, so it's just a case of rearranging to find L. Or, L = 1000 / (2 pi times F)
Hopefully this makes sense,
Mark
