11/29/2018
Audio Open Frame (148 Series) - Hammond Mfg.
Quality Products. Service Excellence.
Audio Open Frame
148 Series
PC Board Mount
Features
Pin type (0.25" length & 0.025" square), P.C. board mount.
Economical, open type, horizontal bracket construction. 149 Series includes clinching
lugs for extra mounting strength.
Frequency response 200 Hz. - 15 Khz. (+/- 1 db, ref. @ 1 Khz.).
Total distortion approximately 2% for drivers and 1% for outputs at 200 Hz., decreasing at
higher frequencies.
Insertion loss less than 1/2 db.
Bifilar wound for balanced capacitive and resistance characteristics, on pin bobbins for
standard 0.2" grid pin spacing.
Insulation test 250V rms.
For rugged epoxy cast type units refer to our
102, 104, 106
or
107, 108
and
109
series.
Net weight: 0.6 oz. (148 Series) & 1.0 oz. (149 Series).
Notes:
1) For output transformers the current figure is for maximum unbalanced current.
2) D.C. resistance shown is for the total primary or secondary windings (ie...if unit contains
multiple primary or secondary windings the figure shown is with the windings connected in
series).
Part No.
Applicaton
Nominal Impedance
Max. Primary
D.C. current
D.C. Resistance
(Ohms) +/- 15%
Output
Schematic
https://www.hammfg.com/electronics/transformers/audio/148
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11/29/2018
Part No.
Applicaton
(Ohms)
Audio Open Frame (148 Series) - Hammond Mfg.
Max. Primary
(ma.)
(See current
D.C. Note 1)
(ma.)
(See Note 1)
1.9
3.8
0
0
18
11.6
7.5
6.5
5.3
4.1
2.4
2.1
1.9
0.8
0.7
D.C. Resistance
(See Note 2)
Primary
(Ohms) +/- 15%
Secondary
(See Note 2)
Primary
45
11.3
1760
1760
79
220
480
540
850
1700
2230
41
45
380
410
Secondary
300
200
25.4
6.2
60
58
107
230
230
238
123
0.34
14
0
52
(Milliwatts)
300
300
12
3
75
75
75
75
75
75
50
300
300
300
300
Output
(Milliwatts)
Drawing
Schematic
Figure
Drawing
Figure
1
2
2
3
2
2
2
2
2
2
2
4
5
4
5
Primary
Nominal Impedance
Secondary
(Ohms)
Primary
Secondary
600/2400
400/1600
250/1000
1000
125/500
125/500
250/1000
500/2000
500/2000
500/2000
250/1000
3.2
150 ct
3.2
500 ct
148A
148B
148C
148D
148E
148F
148H
148K
148M
148Q
148R
148T
148V
148X
148Y
Input
Input
Input
Input
Driver
Driver
Driver
Driver
Driver
Driver
Driver
Output
Output
Output
Output
150/600
150
50000
200K
500
1500
3000
4000
6000
10000
20000
500 ct
600 ct
4000 ct
5000 ct
Data subject to change without notice
© 2018. Hammond Manufacturing Ltd. All rights reserved.
https://www.hammfg.com/electronics/transformers/audio/148
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Test/Measurement
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