IRON POWDER TOROIDAL CORES
(For Resonant Circuits)
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MATERIAL 3 -- Permeability 35, Freq. Range 0.05 MHz to 0.5 MHz, Color - Gray
Core Number O.D.
(inches) 		I.D.
(inches) 		Hgt
(inches) 		le
(cm) 		Ae
(cm)2 		Ve
(cm)3 		AL Value
µh/100 Turns
T12-3 .125 .062 .050 .74 .010 .007 60
T16-3 .160 .078 .060 .95 .016 .015 61
T20-3 .200 .088 .070 1.15 .025 .029 76
T25-3 .255 .120 .096 1.50 .042 .063 100
T30-3 .307 .151 .128 .183 .065 .119 140
T37-3 .375 .205 .128 2.32 .070 .162 120
T44-3 .440 .229 .159 2.67 .107 .286 180
T50-3 .500 .303 .190 3.03 .121 .367 175
T68-3 .690 .370 .190 4.24 .196 .831 195
T80-3 .795 .495 .250 5.15 .242 1.246 180
T94-3 .942 .560 .312 6.00 .385 2.310 248
T106-3 1.060 .570 .437 6.50 .690 4.485 450
T130-3 1.300 .780 .437 8.29 .730 6.052 350
T157-3 1.570 .950 .570 10.05 1.140 11.457 420
T184-3 1.840 .950 .710 11.12 2.040 22.685 720
T200-3 2.000 1.250 .550 12.97 1.330 17.250 425
T200A-3 2.000 1.250 1.000 12.97 2.240 29.050 460
T225-3 2.250 1.405 .550 14.56 1.508 21.956 425

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