Ferrite Rod Coil
Électronique /
Electronic
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 |