IRON POWDER TOROIDAL CORES
(For Resonant Circuits)
 
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MATERIAL 2 -- Permeability 10, Freq. Range 2 MHz to 30 MHz, Color - Red
Core Number O.D.
(inches) 		I.D.
(inches) 		Hgt
(inches) 		le
(cm) 		Ae
(cm)2 		Ve
(cm)3 		AL Value
µh/100 Turns
T12-2 .125 .062 .050 .74 .010 .007 20
T16-2 .160 .078 .060 .95 .016 .015 22
T20-2 .200 .088 .070 1.15 .025 .029 25
T25-2 .255 .120 .096 1.50 .042 .063 34
T30-2 .307 .151 .128 1.83 .065 .119 43
T37-2 .375 .205 .128 2.32 .070 .162 40
T44-2 .440 .229 .159 2.67 .107 .286 52
T50-2 .500 .303 .190 3.03 .121 .367 49
T68-2 .690 .370 .190 4.24 .196 .831 57
T80-2 .795 .495 .250 5.15 .242 1.246 55
T94-2 .942 .560 .312 6.00 .385 2.310 84
T106-2 1.060 .780 .437 6.50 .690 4.485 135
T130-2 1.300 .950 .437 8.29 .730 6.052 110
T157-2 1.570 .950 .570 10.05 1.140 11.457 140
T184-2 1.840 1.250 .710 11.12 2.040 22.685 240
T200-2 2.000 1.250 .550 12.97 1.330 17.250 120
T200A-2 2.000 1.405 1.000 12.97 2.240 29.050 218
T225-2 2.250 1.485 .550 14.56 1.508 21.956 120
T225A-2 2.250 1.250 1.000 14.56 2.730 39.749 215
T300-2 3.058 1.925 .500 19.83 1.810 35.892 114
T300A-2 3.048 1.925 1.000 19.83 3.580 70.991 228
T400-2 4.000 2.250 .650 24.93 3.660 91.244 180
T400A-2 4.000 2.250 1.300 24.93 7.432 185.250 360
T520-2 5.200 3.080 .800 33.16 5.460 181.000 207



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