Coil Winding Data

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Turns Per Inch Coil Winding Formulas
Gauge (AWG) or (B&S) Number Of Turns per Linear Inch The following approximations for winding r-f coils are accurate to within approx. 1% for nearly all small air-core coils, where
Enamel S.S.C. D.S.C. and S.C.C. D.C.C.
1 – – 3.3 3.3 L = self inductance in microhenrys
N = total number of turns
r = mean radius in inches
l= length of coil in inches
b = depth of coil in inches.
2 – – 3.8 3.6
3 – – 4.2 4.0
4 – – 4.7 4.5
5 – – 5.2 5.0 single-Layer Wound Coils
6 – – 5.9 5.6
7 – – 6.5 6.2
8 7.6 – 7.4 7.1
9 8.6 – 8.2 7.8
10 9.6 – 9.3 8.9
11 10.7 – 10.3 9.8
12 12.0 – 11.5 10.9
13 13.5 – 12.8 12.0
14 15.0 – 14.2 13.8
15 16.8 – 15.8 14.7
16 18.9 18.9 17.9 16.4
17 21.2 21.2 19.9 18.1 Multi-Layer Wound Coils
18 23.6 23.6 22.0 19.8
19 26.4 26.4 24.4 21.8
20 29.4 29.4 27.0 23.8
21 33.1 32.7 29.8 26.0
22 37.0 36.5 34.1 30.0
23 41.3 40.6 37.6 31.6
24 46.3 45.3 41.5 35.6
25 51.7 50.4 45.6 38.6
26 58.0 55.6 50.2 41.8
27 64.9 61.5 55.0 45.0
28 72.7 68.6 60.2 48.5
29 81.6 74.8 65.4 51.8 Spiral Wound Coils
30 90.5 83.3 71.5 55.5
31 101. 92.0 77.5 59.2
32 113. 101. 83.6 62.6
33 127. 110. 90.3 66.3
34 143. 120. 97.0 70.0
35 158. 132. 104. 73.5
36 175. 143. 111. 77.0

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