Audio Power Amplifier Design by Douglas Self
Author:Douglas Self
Language: eng
Format: epub, pdf
Publisher: Focal Press
As with single layer coils, there are proportions which give the maximum efficiency. This is called a Brooks coil, and an example is shown in Figure 14.12. The coil windings have a square cross-section, with c = length and radius = 3c/2. To put it another way the inner diameter is equal to twice the height (or length) of the coil winding. For this special case a suitably accurate approximation for the inductance is delightfully simple, as in Equation 14.6.
Equation 14.6
Where:
r is coil radius in metres
N is the number of turns
L is inductance in uH
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