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Amidon
Cores, Beads, Rods
and Balun Kits

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The Amidon Associates produces a broad line of ferrite beads, coil forms, cores and specialty items for the electronic experimenter.
These products have wide use in RFI suppressions, antenna design and matching. (Dimensions are in inches). Click here for material chart.

A Ferrite bead is a dowel-like device which has a center hole and is composed of ferromagnetic material.

When placed on to a current carrying conductor it will act as an RF choke. It offers convenient, inexpensive, yet effective means
of RF shielding, parasitic suppression and RF decoupling.
Order # Model Description Pkg. O.D. I.D. Height RFI Attenuation Price Order
#1529 FB  43-    101 Ferrite Beads   12 .138 .051 .128 40-200 MHz $3.00
#4610 FB  43-    201 Ferrite Beads   12 .076 .043 .150 30-400 MHz $4.00
#1528 FB  43-    801 Ferrite Beads   12 .296 .094 .297 40-200 MHz $4.00
#1530 FB  43-  2401 Ferrite Beads   12 .380 .197 .190 40-200 MHz $4.50
#4491 FB  43-  6301 Ferrite Beads   12 .375 .194 .410 40-200 MHz $5.00
#2080 FB  61-    101 Ferrite Beads   12 .138 .051 .128 above 200 MHz $3.50
#1532 FB  73-    101 Ferrite Beads   12 .138 .051 .128 10-50 MHz $3.50
#1533 FB  73-    801 Ferrite Beads   12 .296 .094 .297 10-50 MHz $5.00
#0810 FB  73-  1801 Ferrite Beads   12 .200 .062 .437 10-50 MHz $4.75
#1415 FB  73-  2401 Ferrite Beads   12 .380 .197 .190 10-50 MHz $5.00
#1460 FB  75B-  101 Ferrite Beads   12 .138 .051 .128 2-30 MHz $5.00
#2838 FB  77-  6301 Ferrite Beads   12 .375 .194 .410 2-30 MHz $9.50

Ferrite toroidal cores. AL values = mH/1000 turns. First numerals in model indicate O.D., second indicate material.
Order # Model Description Pkg. O.D. I.D. Height AL Price Order
#1536 FT  23-61 Ferrite Toroidal Core   4 .230 .120 .060 24.8 $  3.50
#1537 FT  23-77 Ferrite Toroidal Core   4 .230 .120 .060 356 $  3.00
#1538 FT  37-43 Ferrite Toroidal Core   4 .375 .187 .125 420 $  4.00
#0602 FT  37-61 Ferrite Toroidal Core   4 .375 .187 .125 55.3 $  4.00
#4348 FT  37-67 Ferrite Toroidal Core   4 .375 .187 .125 17.7 $  4.00
#1542 FT  50-43 Ferrite Toroidal Core   3 .500 .281 .188 523 $  4.00
#1543 FT  50-61 Ferrite Toroidal Core   3 .500 .281 .188 68 $  3.50
#2532 FT  50-J Ferrite Toroidal Core   3 .500 .281 .188 2710 $  3.50
#1544 FT  82-43 Ferrite Toroidal Core   3 .825 .520 .250 557 $  4.00
#3579 FT  82-61 Ferrite Toroidal Core   3 .825 .520 .250 73.3 $  6.00
#2640 FT  82-77 Ferrite Toroidal Core   3 .825 .520 .250 1060 $  6.00
#3494 FT114-43 Ferrite Toroidal Core   1 1.142 .750 .295 603 $  3.50
#1546 FT114-61 Ferrite Toroidal Core   1 1.142 .750 .295 79.3 $  4.00
#2953 FT193A-F Ferrite Toroidal Core   1 1.932 1.250 .750 4460 $12.00
#5955 FT193-J Ferrite Toroidal Core   1 1.932 1.252 .625 6065 $10.00
#0484 FT240-43 Ferrite Toroidal Core   1 2.400 1.400 .500 1240 $10.00
#1548 FT240-61 Ferrite Toroidal Core   1 2.400 1.400 .500 173 $13.00
#2954 FT240-77 Ferrite Toroidal Core   1 2.400 1.400 .500 3130 $12.00
#3703 FT240-K Ferrite Toroidal Core   1 2.400 1.400 .500   $19.95

Iron powder toroidal cores. AL values = µH/100 turns.
Order # Model Description Pkg. O.D. I.D. Height AL Price Order
#1552 T  25-  2 Iron Powder Toroidal Core   5 .250 .120 .096 34 $  4.00
#1554 T  30-  6 Iron Powder Toroidal Core   5 .370 .151 .128 36 $  4.00
#0647 T  37-  2 Iron Powder Toroidal Core   5 .375 .205 .128 40 $  4.00
#4347 T  37-  6 Iron Powder Toroidal Core   5 .375 .205 .128 30 $  4.00
#1562 T  37-10 Iron Powder Toroidal Core   5 .375 .205 .128 25 $  4.00
#4869 T  44-10 Iron Powder Toroidal Core   4 .440 .229 .159 33 $  4.00
#1564 T  50-  2 Iron Powder Toroidal Core   4 .500 .300 .190 49 $  4.00
#1565 T  50-  6 Iron Powder Toroidal Core   4 .500 .300 .190 40 $  4.00
#4821 T  50-10 Iron Powder Toroidal Core   4 .500 .303 .190 31 $  4.00
#1566 T  68-  2 Iron Powder Toroidal Core   4 .690 .370 .190 57 $  5.00
#1290 T  68-  6 Iron Powder Toroidal Core   4 .690 .370 .190 47 $  5.00
#1556 T  80-  2 Iron Powder Toroidal Core   3 .795 .495 .250 55 $  5.00
#1567 T  94-26 Iron Powder Toroidal Core   2 .942 .560 .312 590 $  6.00
#1557 T106-  2 Iron Powder Toroidal Core   2 1.060 .570 .437 325 $  6.00
#4609 T106-  6 Iron Powder Toroidal Core   2 1.060 .570 .437 116 $  6.00
#0781 T184-  1 Iron Powder Toroidal Core   1 1.840 .950 .710 240 $  8.00
#1559 T200-  2 Iron Powder Toroidal Core   1 2.000 1.250 .550 120 $  7.00

Multi-aperture cores. AL values = mh/1000 turns.
Order # Model Description Pkg. O.D. I.D. Hght Th AL Price Order
#0471 BN-43-202 Two Hole Core   4 .525 .150 .550 .295 2890 $  3.50
#1871 BN-43-302 Two Hole Core   4 .525 .150 .407 .295 2200 $  4.00
#6394 BN-73-702 Two Hole Core   4 .525 .150 .550 .295 8500 $  4.50

Split cores.
Order # Model Description Pkg. O.D. I.D. Hght D Max cbl D. Price Order
#1087 2x31-3551p2 Split cores for round cable   1 1.15 .740 1.650 .579 0.750 $  9.99
#4658 2x31-4281p2 Split cores for round cable   1 .788 .260 1.550 .385 0.275 $  5.50
#1844 2x43-  251p2 Split cores for round cable   1 .705 .275 1.272 .362 0.250 $  4.75
#1138 2x43-  151p2 Split cores for round cable   1 1.142 .528 1.280 .583 0.500 $  7.50

Ferrite rods. AL values = mH/1000 turns.
Order # Model Description Material Diameter Length AL Perm. Price Order
#1549 R33-050750 Ferrite Rod 33 .50 7.5 70 800 $21.00
#0490 R61-050400 Ferrite Rod 61 .50 4.0 43 125 $  9.00
#2384 R61-050750 Ferrite Rod 61 .50 7.5 49 125 $21.00

Balun Kits.
Order # Model Description Core Wire Ratios Price Order
#1525 AB-200-  10 Balun Kit T200-2 14 gauge 10 feet 4:1 or 1:1 $  7.95
#1526 AB-240-125 Balun Kit FT-240-61 14 gauge 10 feet 4:1 or 1:1 $12.95

Click here for information on the Amidon Technical Reference.


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