Трансформатор LUNDAHL LL1678. Инструкция на английском языке

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Moving Coil Input Transformer
LL1678
LL1678 is an input audio transformer for moving coil pickups. The transformer is built up from two coils, each
coil with one secondary winding surrounded by two primary windings. This structure results in an excellent
frequency response. All winding ends are available on the pins. Thus, the transformer can be used with a set of
different turn’s ratios.
The LL1678 is made with amorphous core material. As this type of core does not store energy (unlike e.g.
conventional mu-metal cores) the low frequency resonance with external series capacitors is practically
eliminated.
Turns  ratio:                                            1 + 1 + 1 + 1 : 16 + 16
Dims: (Length x Width x Height above PCB (mm))           30 x 22.5 x 14.5
Pin Layout (viewed from pins side) and windings schematics:
1
2                    9
3
10
4
1                9
2               10
3               11                       8
4
5               13                       7                    16
6               14
7               15
8               16
6                    15
5
Can + Core  13, 14
Spacing between pins:   Spacing between rows of pins:   Rec. PCB hole diameter:   Weight:
2.54 mm  (0.1")        22.86 mm  (0.9")             1.5 mm                       27 g
Static resistance of each primary (average):           4.5 W
Static resistance of each secondary:                   375 W
Frequency response (primary signal level -17 dBU [0.1Vrms].
Termination alternative A. Source 50W  , load 100 kW) :
Balanced/unbalanced input. Balanced output      10 Hz -- 90 kHz +/- 1 dB
Balanced/unbalanced input. Unbalanced output    10 Hz -- 35 kHz +/- 1 dB
Distortion (primaries connected in series,             <  0.5% @ -8  dBU,  50 Hz
source impedance 50W ):
Primary no load impedance @ 0 dBU, 50 Hz, all in series:   8 kW typically
Core / Can:                                            Amorphous Strip Core / Mu metal can
Isolation between windings / between windings and core:   3 kV / 1.5 kV
Turns ratio and possible use at different termination alternatives.
When the LL1678 is used in
Termination alternatives are shown  on the next page
MC pickup applications,
Termination   Turns   Copper Resistance   Possible Use
Alternative    ratio      prim/sec                                  please note that the primary
side of the transformer must
A       1:8       18W / 750 W        150W / 10 kW              have a ground reference.
B       1:8      4.5W / 190 W      Not  recommended
C       1:16     4.5W / 790 W         25W / 10kW
D       1:16     1.1W / 190 W      Not  recommended
E       1:32     1.1W / 790 W         10W / 10kW
R020201

LL1678 Termination Alternatives
(Left side is input if not stated otherwise)
(Pins side view)
1                9
1                 9                              2               10
2               10                               3      A        11
3               11                               4
4                                                5   CENTER TAP   13
5     A         13                               6               14
6               14                               7               15
7               15                               8               16
8               16                  CT
1                9                                1                9
2               10                                2               10
3               11                                3               11
4                                   CT            4     B
5     B         13                                5  CENTER TAP   13
6               14                                6               14
7               15                                7               15
8               16                                8               16
1                9                                1                9
2               10                                2               10
3               11                                3               11
4                                   CT            4    C
5     C         13                                5               13
6               14                                6   CENTER TAP   14
7               15                                7               15
8               16                                8               16
1                 9                               1                9
2               10
10
3               11                                2               11
3
4
5     D         13                                4
6               14                                5    E          13
7               15                                6               14
8               16                                7               15
8               16
1                9                               1                9
OUT 1         2               10                               2               10         OUT 1
3      F        11                               3               11
4   SPLIT                 IN                     4     G
5               13                               5               13
OUT 2         6               14                               6     SPLIT     14
7               15                               7               15
8               16                               8               16         OUT 2