|
Ferrite Bobbin cores provide a convenient means of winding RF chokes.
Because of their open magnetic path, they can handle more current than
toroids of similar effective area. To aid in the design of such chokes,
we have provided tables containing inductance, wire turns, wire size and
maximum current for each type of bobbin.
(physical dimension graphics)
Dimensions are in inches; AL values are in mh/1000
turns.
|
Part Number
|
A
|
B
|
C
|
D
|
F
|
AL
|
NI
|
|
Bobbin #B-77-1111
|
.196
|
.107
|
.500
|
.400
|
#22
|
17
|
60
|
|
Bobbin #B-77-1011
|
.372
|
.187
|
.750
|
.500
|
#20
|
39
|
130
|
|
Winding Table: number of turns to completely fill bobbin
|
|
Wire Size>
|
20
|
22
|
24
|
26
|
28
|
30
|
32
|
34
|
36
|
|
B-77-1111
|
9
|
14
|
23
|
35
|
56
|
88
|
164
|
205
|
400
|
|
B-77-1011
|
24
|
39
|
60
|
93
|
148
|
230
|
425
|
535
|
1050
|
|
#B-77-1111
|
AL=17
|
NI=60
|
|
Inductance
|
wire
turns
|
wire
size
|
I
(max)
|
|
10 µh
|
24
|
24
|
2.50
|
|
25 µh
|
28
|
26
|
1.60
|
|
50 µh
|
28
|
26
|
1.60
|
|
100 µh
|
77
|
30
|
0.78
|
|
250 µh
|
121
|
31
|
0.50
|
|
500 µh
|
171
|
32
|
0.35
|
|
1.0 mh
|
243
|
34
|
0.25
|
|
2.5 mh
|
383
|
36
|
0.16
|
|
5.0 mh
|
542
|
37
|
0.11
|
|
10.0 mh
|
762
|
38
|
0.08
|
|
|
#B-77-1011
|
AL=39
|
NI=130
|
|
Inductance
|
wire
turns
|
wire
size
|
I
(max)
|
|
25 µh
|
25
|
20
|
5.20
|
|
50 µh
|
26
|
22
|
3.60
|
|
100 µh
|
50
|
24
|
2.60
|
|
250 µh
|
80
|
26
|
1.60
|
|
500 µh
|
113
|
27
|
1.10
|
|
1.0 mh
|
160
|
28
|
0.80
|
|
2.5 mh
|
253
|
30
|
0.50
|
|
5.0 mh
|
358
|
32
|
0.36
|
|
10.0 mh
|
506
|
34
|
0.25
|
|
25.0 mh
|
800
|
36
|
0.16
|
|
|
