Ferrite Rod Coil
Électronique

L(uH) = 0,394 * r2 * N2 / (9r + 10a)   a and r = cm

l(mm) = a = (( 0,394 * r2 * N2 / L) - 9r) / 10

N = sqr( L * (9r + 10A) / (0,394r^2))

Rod material = 61 permeability = 125

4 mm D x 30 mm L effective permeability uRod = 25

6 mm D x 55 mm effective permeability uRod = 22

6 mm D x 100 mm effective permeability uRod = 26

8 mm D x 45 mm effective permeability uRod = 24

9 mm D x 75 mm effective permeability uRod = 32

13 mm D x 100 mm effective permeability uRod = 43

Calculate L(uH) of the Ferrite rod

1° Calculate L(uH) of the air coil

L(uH) = 0,394 * r2 * N2 / (9r + 10a)

2° Multiply L(uH) by uRod

Calculate Core Length

Multiply Wire diameter by number of turns

Calculate length of wire

length of wire = D*N*pi

D = dia of Ferritee core

N = number of turns

pi = 3.14159265359

Inductance of Ferrite Rod Coil for AM radio

165 L(uH), 250 L(uH), 260 L(uH), 330 L(uH), 470 L(uH), 570 L(uH), 680 L(uH)

Capacitor for Ferrite Rod Coil for AM radio

 uH pF 165 540 (270 x 2) 250 330 260 330 330 270 470 180 570 155 680 140

Ferrite Rod Coil (ui = 125)

 32 awg Wire dia mm 0,202 uRod = 25 Coil Diameter mm Length mm uRod = 22 Coil Diameter mm Length mm 4 30 With 6 55 With Coil Radius 2 Wire Ferrit Coil Radius 3 Wire Ferrit Core Lenght Inductance Lenght Rod Core Lenght Inductance Lenght Rod mm Turns uH mm uH mm Turns uH mm uH 19 93 6,621 1169 166 11 54 7,599 1018 167 28 137 10,036 1722 251 15 76 11,346 1433 250 29 142 10,425 1784 261 16 79 11,861 1489 261 20 97 14,966 1828 329 uRod = 26 Coil Diameter mm Length mm 27 134 21,389 2526 471 6 100 With 32 160 25,922 3016 570 Coil Radius 3 Wire Ferrit 38 189 30,987 3563 682 Core Lenght Inductance Lenght Rod mm Turns uH mm uH 9 47 6,424 886 167 13 66 9,635 1244 251 14 68 9,976 1282 259 17 84 12,721 1583 331 23 115 18,086 2168 470 28 137 21,912 2582 570 33 162 26,271 3054 683

 30 awg Wire dia mm 0,255 uRod = 22 Coil Diameter mm Length mm uRod = 26 Coil Diameter mm Length mm 6 55 With 6 100 With Coil Radius 3 Wire Ferrit Coil Radius 3 Wire Ferrit Core Lenght Inductance Lenght Rod Core Lenght Inductance Lenght Rod mm Turns uH mm uH mm Turns uH mm uH 16 63 7,500 1188 165 14 53 6,143 999 160 23 91 11,335 1715 249 20 79 9,687 1489 252 24 95 11,886 1791 261 21 81 9,962 1527 259 30 118 15,058 2224 331 26 101 12,712 1904 331 42 164 21,423 3091 471 36 140 18,099 2639 471 50 196 25,859 3695 569 43 168 21,977 3167 571 50 198 26,136 3732 680

 28 awg Wire dia mm 0,321 uRod = 22 Coil Diameter mm Length mm uRod = 24 Coil Diameter mm Length mm 6 55 With 8 45 With Coil Radius 3 Wire Ferrit Coil Radius 4 Wire Ferrit Core Lenght Inductance Lenght Rod Core Lenght Inductance Lenght Rod mm Turns uH mm uH mm Turns uH mm uH 24 76 7,559 1433 166 14 44 6,886 1106 165 36 111 11,398 2092 251 20 63 10,503 1583 252 37 115 11,838 2168 260 21 65 10,887 1634 261 46 144 15,029 2714 331 26 80 13,779 2011 331 35 110 19,604 2765 470 42 131 23,698 3292 569 uRod = 26 Coil Diameter mm Length mm uRod = 32 Coil Diameter mm Length mm 6 100 With 9 75 With Coil Radius 3 Wire Ferrit Coil Radius 4,5 Wire Ferrit Core Lenght Inductance Lenght Rod Core Lenght Inductance Lenght Rod mm Turns uH mm uH mm Turns uH mm uH 20 63 6,140 1188 160 11 35 6,394 990 166 30 95 9,641 1791 251 16 49 9,685 1385 252 31 98 9,970 1847 259 16 51 10,162 1442 264 39 123 12,718 2318 331 20 62 12,805 1753 333 55 172 18,115 3242 471 27 84 18,152 2375 472 66 207 21,974 3902 571 32 100 22,071 2827 574 79 245 26,166 4618 680 38 117 26,250 3308 682

 26 awg Wire dia mm 0,405 uRod = 24 Coil Diameter mm Length mm uRod = 32 Coil Diameter mm Length mm 8 45 With 9 75 With Coil Radius 4 Wire Ferrit Coil Radius 4,5 Wire Ferrit Core Lenght Inductance Lenght Rod Core Lenght Inductance Lenght Rod mm Turns uH mm uH mm Turns uH mm uH 21 52 6,912 1307 166 13 33 4,989 933 160 30 75 10,437 1885 250 19 48 7,826 1357 250 32 78 10,899 1960 262 20 50 8,208 1414 263 39 97 13,831 2438 332 25 61 10,324 1725 330 34 84 14,788 2375 473 uRod = 43 Coil Diameter mm Length mm 41 100 17,909 2827 573 13 100 With 47 117 21,234 3308 679 Coil Radius 6,5 Wire Ferrit Core Lenght Inductance Lenght Rod mm Turns uH mm uH 10 25 6,513 1021 169 14 34 9,808 1389 255 14 35 10,183 1429 265 17 42 12,845 1715 334 23 56 18,298 2287 476 26 65 21,859 2655 568 31 76 26,249 3104 682

 24 awg Wire dia mm 0,511 uRod = 32 Coil Diameter mm Length mm uRod = 43 Coil Diameter mm Length mm 9 75 With 13 100 With Coil Radius 4,5 Wire Ferrit Coil Radius 6,5 Wire Ferrit Core Lenght Inductance Lenght Rod Core Lenght Inductance Lenght Rod mm Turns uH mm uH mm Turns uH mm uH 20 39 5,061 1103 162 10 19 3,862 776 166 29 57 7,813 1612 250 13 26 5,881 1062 253 30 59 8,121 1668 260 14 27 6,177 1103 266 37 73 10,282 2064 329 16 32 7,678 1307 330 52 102 14,778 2884 473 22 43 11,063 1756 476 62 122 17,886 3449 572 26 50 13,254 2042 570 30 58 15,780 2369 679

 22 awg Wire dia mm 0,644 uRod = 32 Coil Diameter mm Length mm uRod = 43 Coil Diameter mm Length mm 9 75 With 13 100 With Coil Radius 4,5 Wire Ferrit Coil Radius 6,5 Wire Ferrit Core Lenght Inductance Lenght Rod Core Lenght Inductance Lenght Rod mm Turns uH mm uH mm Turns uH mm uH 30 46 5,014 1301 160 14 21 3,789 858 163 44 69 7,834 1951 251 19 30 5,952 1225 256 46 71 8,080 2007 259 20 31 6,197 1266 266 57 89 10,298 2516 330 24 37 7,679 1511 330 32 50 10,937 2042 470 38 59 13,216 2410 568 44 69 15,761 2818 678

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