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Copyright: 1996 - 2024 Webmaster:
Kirt Blattenberger,
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
AirplanesAndRockets.com
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Sub-Header - RF Cafe
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Toroids: Powdered Iron |
Use the table below to
calculate inductance and number of turns per the following formulas.
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Where:
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L = inductance in µH
AL = µH per 100 turns N = number of full turns |
Size |
26 |
3 |
15 |
1 |
2 |
7 |
6 |
10 |
12 |
17 |
0 |
T-12 |
n/a |
60 |
50 |
48 |
20 |
18 |
17 |
12 |
7.5 |
7.5 |
3.0 |
T-16 |
145 |
61 |
55 |
44 |
22 |
n/a |
19 |
13 |
8.0 |
8.0 |
3.0 |
T-20 |
180 |
76 |
55 |
52 |
27 |
24 |
22 |
16 |
10 |
10 |
3.5 |
T-25 |
235 |
100 |
85 |
70 |
34 |
29 |
27 |
19 |
12 |
12 |
4.5 |
T-30 |
325 |
140 |
93 |
85 |
43 |
37 |
36 |
25 |
16 |
16 |
6.0 |
T-37 |
275 |
120 |
90 |
80 |
40 |
32 |
30 |
25 |
15 |
15 |
4.9 |
T-44 |
360 |
180 |
160 |
105 |
52 |
46 |
42 |
33 |
18.5 |
18.5 |
6.5 |
T-50 |
320 |
175 |
135 |
100 |
49 |
43 |
40 |
31 |
18 |
18 |
6.4 |
T-68 |
420 |
195 |
180 |
115 |
57 |
52 |
47 |
32 |
21 |
21 |
7.5 |
T-80 |
450 |
180 |
170 |
115 |
55 |
50 |
45 |
32 |
22 |
22 |
8.5 |
T-94 |
590 |
248 |
200 |
160 |
84 |
n/a |
70 |
58 |
32 |
n/a |
10.6 |
T-106 |
900 |
450 |
345 |
325 |
135 |
133 |
116 |
n/a |
n/a |
n/a |
19 |
T-130 |
785 |
3350 |
250 |
200 |
110 |
103 |
96 |
n/a |
n/a |
n/a |
15 |
T-157 |
870 |
420 |
360 |
320 |
140 |
n/a |
115 |
n/a |
n/a |
n/a |
n/a |
T-184 |
1640 |
720 |
n/a |
500 |
240 |
n/a |
195 |
n/a |
n/a |
n/a |
n/a |
T-200 |
895 |
425 |
n/a |
250 |
120 |
105 |
100 |
n/a |
n/a |
n/a |
n/a |
26 |
Yellow/White |
Hydrogen Reduced |
75 |
825 |
DC -1 |
EMI filters, DC chokes |
3 |
Gray |
Carbonyl HP |
35 |
370 |
0.05 - 0.50 |
Exc. stability, good Q at low freq. |
15 |
Red/White |
Carbonyl GS6 |
25 |
190 |
0.10 - 2 |
Exc. stability, good Q |
1 |
Blue |
Carbonyl C |
20 |
280 |
0.50 - 5 |
Exc. stability, good Q at low freq. |
2 |
Red |
Carbonyl E |
10 |
95 |
2 -30 |
High Q |
7 |
White |
Carbonyl TH |
9 |
30 |
3 - 35 |
Similar to mix 2 and mix 6, exc. temp stability |
6 |
Yellow |
Carbonyl SF |
8 |
35 |
10 -50 |
Very good Q and temp. stability for 20-50 MHz |
10 |
Black |
Powdered Iron W |
6 |
150 |
30 - 100 |
Good Q and stability for 40-100 MHz |
12 |
Green/White |
Synthetic Oxide |
4 |
170 |
50 - 200 |
Good Q, moderate temp. stability |
17 |
Blue/Yellow |
Carbonyl |
4 |
50 |
40 - 180 |
Similar to mix 12, better temp. stability, Q drops about 10% above 50 MHz, 20% above 100 MHz |
0 |
Tan |
Phenolic |
1 |
0 |
100 - 300 |
L varies greatly with winding technique |
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Size |
Color |
Dimensions (in) |
O.D. |
I.D. |
Height |
T-200-2 |
Red |
2.00 |
1.25 |
0.55 |
T-94-2 |
Red |
0.94 |
0.56 |
0.31 |
T-80-2 |
Red |
0.80 |
0.50 |
0.25 |
T-68-2 |
Red |
0.68 |
0.37 |
0.19 |
T-50-2 |
Red |
0.50 |
0.30 |
0.19 |
T-37-2 |
Red |
0.37 |
0.21 |
0.12 |
T-25-2 |
Red |
0.25 |
0.12 |
0.09 |
T-12-2 |
Red |
0.125 |
0.06 |
0.05 |
T-50-10 |
Black |
0.50 |
0.30 |
0.19 |
T-37-10 |
Black |
0.37 |
0.21 |
0.12 |
T-25-10 |
Black |
0.25 |
0.12 |
0.09 |
T-12-10 |
Black |
0.125 |
0.06 |
0.05 |
T-94-9 |
Yellow |
0.94 |
0.56 |
0.31 |
T-80-6 |
Yellow |
0.80 |
0.50 |
0.25 |
T-68-6 |
Yellow |
0.68 |
0.37 |
0.19 |
T-50-6 |
Yellow |
0.50 |
0.30 |
0.19 |
T-26-6 |
Yellow |
0.25 |
0.12 |
0.09 |
T-12-6 |
Yellow |
0.125 |
0.06 |
0.05 |
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