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QRZ Page: VK6YSF
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TOROIDAL
IRON CORE INDUCTOR DESIGN
Powdered
Iron Toroidal Core Inductor Calculation.
HOME >
OPERATIONAL
>REFERENCES >
Calculation
to determine the number of turns required for a range of powdered iron
core toroids to achieve a particular inductance value.
L =
Inductance in uH
 =
Inductive index in uH per 100 turns as specified by the
manufacturer.
N =
Number of turns.
Example
The number of turns
required for a 12uH inductor if the
for
the selected powdered iron core is 49 (T-50-2).
|
AL
Value
|
|
Mix
Type
|
|
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
|
|
T-16
|
145
|
61
|
55
|
44
|
22
|
n/a
|
19
|
13
|
8
|
8
|
3
|
|
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
|
|
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
|
Table of AL values for a
selection of powdered iron
core toroids.
|
Iron
Powder Magnetic Core Dimensions
|
|
Size
|
Colour
|
Dimensions
|
|
O.D.
|
I.D.
|
HEIGHT
|
|
in
|
mm
|
in
|
mm
|
in
|
mm
|
|
T-200-2
|
Red
|
2
|
50.80
|
1.25
|
31.75
|
0.55
|
13.97
|
|
T-94-2
|
Red
|
0.94
|
23.88
|
0.56
|
14.224
|
0.31
|
7.874
|
|
T-80-2
|
Red
|
0.8
|
20.32
|
0.5
|
12.7
|
0.25
|
6.35
|
|
T-68-2
|
Red
|
0.68
|
17.27
|
0.37
|
9.398
|
0.19
|
4.826
|
|
T-50-2
|
Red
|
0.5
|
12.70
|
0.3
|
7.62
|
0.19
|
4.826
|
|
T-37-2
|
Red
|
0.37
|
9.40
|
0.21
|
5.334
|
0.12
|
3.048
|
|
T-25-2
|
Red
|
0.25
|
6.35
|
0.12
|
3.048
|
0.09
|
2.286
|
|
T-12-2
|
Red
|
0.125
|
3.18
|
0.06
|
1.524
|
0.05
|
1.27
|
|
T-50-10
|
Black
|
0.5
|
12.70
|
0.3
|
7.62
|
0.19
|
4.826
|
|
T-37-10
|
Black
|
0.37
|
9.40
|
0.21
|
5.334
|
0.12
|
3.048
|
|
T-25-10
|
Black
|
0.25
|
6.35
|
0.12
|
3.048
|
0.09
|
2.286
|
|
T-12-10
|
Black
|
0.125
|
3.18
|
0.06
|
1.524
|
0.05
|
1.27
|
|
T-94-9
|
Yellow
|
0.94
|
23.88
|
0.56
|
14.224
|
0.31
|
7.874
|
Table of core dimensions
for a selection of powdered iron
core toroids.
|
Iron Powder
Magnetic Core Properties
|
|
Mix
|
Color
|
Material
|
μ
|
Temp
|
f
(MHz)
|
Uses
|
|
Stability
|
|
(ppm/°C)
|
|
26
|
Yellow/White
|
Hydrogen
Reduced
|
75
|
825
|
DC
-10MHz
|
EMI
filters, DC chokes
|
|
3
|
Gray
|
Carbonyl
HP
|
35
|
370
|
0.05
- 0.500MHz
|
Exc.
stability, good Q at low freq.
|
|
15
|
Red/White
|
Carbonyl
GS6
|
25
|
190
|
0.10
- 20MHz
|
Exc.
stability, good Q
|
|
1
|
Blue
|
Carbonyl
C
|
20
|
280
|
0.50
- 50MHz
|
Exc.
stability, good Q at low freq.
|
|
2
|
Red
|
Carbonyl
E
|
10
|
95
|
2
- 30MHz
|
High
Q
|
|
7
|
White
|
Carbonyl
TH
|
9
|
30
|
3
- 35MHz
|
Similar
to mix 2 and mix 6, exc. temp stability
|
|
6
|
Yellow
|
Carbonyl
SF
|
8
|
35
|
10
- 50MHz
|
Very
good Q and temp. stability for 20-50 MHz
|
|
10
|
Black
|
Powdered
Iron W
|
6
|
150
|
30
- 1000MHz
|
Good
Q and stability for 40-100 MHz
|
|
12
|
Green/White
|
Synthetic
Oxide
|
4
|
170
|
50
- 2000MHz
|
Good
Q, moderate temp. stability
|
|
17
|
Blue/Yellow
|
Carbonyl
|
4
|
50
|
40
- 1800MHz
|
Similar
to mix 12, better temp. stability, Q drops about 10% above 50
MHz, 20% above 100 MHz
|
|
0
|
Tan
|
Phenolic
|
1
|
0
|
100
- 3000MHz
|
L
varies greatly with winding technique
|
Table of core properties
for powdered iron
core.
Iron Powder Core Inductor Design
Software: http://www.micrometals.com/material/IPIDsgnSoftwaretxt.html
TOP
OF PAGE
Page initiated 18 April,
2016
Page
last revised 05 November, 2025
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Space Weather
https://www.swpc.noaa.gov/
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Nikola Tesla, born on 10 July 1856, was one of
history's most influential inventors.
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Notice Board
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VK6YSF JS8Call and
Olivia 8/250 operations.
Current activity is generally
focused - though not restricted to - JS8Call operations on the 30m, and 40m bands.
Olivia 8/250 is used occasionally on the 20m band.
Proposed
band and mode activity
is often communicated on HamSpots: https://hamspots.net/js8/
or my profile on
X: https://x.com/vk6ysf97230
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Post
date: 5 July 2026
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Local
Repeaters
The Local Repeaters page has been updated with expanded and refreshed information on VHF and UHF repeaters across Western Australia's Central Coast, Perth, the Avon Valley, and the Peel region.
See: https://vk6ysf.com/local_repeaters.htm
Post
date: 5 July 2026
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MARMOTSat
An exciting upcoming amateur radio CubeSat
Proposed
launch date: 7 July 2026
Expected payload includes:
145.875 MHz – AX.25 packet digipeater
436.125 MHz – Telemetry & command (digital)
29.410 MHz – CW telemetry beacon, DVB-S2 experiments.
https://marmotsat.ca
https://www.propagationlab.ca/satellite/
Post
date: 5 July 2026
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Western Australian SSTV net
Popular
Western Australian SSTV net for both digital and anolog SSTV.
Generally
found at 7214.0kHz LSB every afternoon from 08:00 UTC (4:00pm WST)
For more
details: https://www.wasstv.net/wasstv.net/index.html
Post
date: 8 December 2025
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VK6MJM LF (136kHz) and MF (474kHz) Beacon
VK6MJM is a LF/MF station
located in Manjimup, Western Australia.
Common Mode: FST4W 300 (Similar to
WSPR)
Note:
other modes and sub-modes may be used.
Station details were presented by
Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter
Hall VK6HP at PerthTech
QRZ Page: VK6MJM
on QRZ.com
Post
date: 10 March 2025
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