Трансформатор LUNDAHL LL7905. Инструкция на английском языке

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Mic/Line Input Transformer Transformers
LL7905
The LL7905 is a large, high level, high performance audio transformer, made for extraordinary requirements.
The transformer combines very high secondary level capability (+37 dBU [54.5V rms] @ 50 Hz ) with low
copper resistance and is designed for the most demanding applications. The LL7905 consists of two coils, each
with two primary and one secondary windings separated by electrostatic shields. The core is a high permeability
mu metal lamination core.
The transformer is magnetically shielded by a mu metal case.
Turns  ratio:                                            1 + 1 + 1 + 1 : 5.6 + 5.6
Dims (Length x Width x Height above PCB (mm)):           66 x 32 x 21
Pin layout  (viewed from pins side) and winding schematics:
7
Coil 1
8              20
1     7                     13    19         1              15
2     8                     14    20                        13 + Core & Can
2
15    21
16    22
6
5     11                    17    23
6     12                    18    24         5              18    Coil 2
12              23
16
11
Note! Isolation between shields is not guaranteed!
Spacing between pins:                     5.08 mm  (0.2")
Spacing between rows of pins:             5.08 / 45.72 mm  (0.2 / 1.8")
Weight:                                   155 g
Rec. PCB hole diameter:                   1.5 mm
Static resistance of each primary (average):                           28W
Static resistance of each secondary (average):                        395W
Distortion (primaries connected in series, source impedance 600W ):   + 10 dBU primary level, 50 Hz:
0.1 %
+ 28 dBU primary level, 50 Hz:
1 %
Self resonance point :                                                80 kHz
Optimum termination for best square-wave response             30kW in series with 100pF
(Connections L4-R2 , source imp.  600W ) :
Frequency response                                             10 Hz - 55 kHz +/- 1 dB
(source and load as above, connection L4-R2, secondary side balanced
with or without grounded centertap.
Frequency response                                             10 Hz - 30 kHz +/- 1 dB
(source and load as above, connection L4-R2, secondary side
unbalanced with pin 23 grounded)
Isolation between primary and secondary windings/ between windings and shield:  4 kV / 2 kV
R020130

Connection alternatives, LL7905
Left side connections                                    NOTE! Pin side view
+
1     7                                                       1     7
1     7
2     8                                                       2     8
2     8
5     11                                                      5     11
+                                     5     11
6     12             +                                        6     12
6     12
L4                             L2                             L1
Right side connections       NOTE! Pin side view
13     19        +              13    19
14     20                       14    20
15     21                       15    21
16     22                       16    22
17     23                       17    23
18     24                       18    24
R2.     Center tap at 15 + 18             R1
Suggested applications using LL7905
Application                   Connections    Max primary level, < 1%   Corresponding
THD@50 Hz               secondary level
Microphone / line input 1:2.8   L4 – R2      +28 dBU  (19.5 V rms)   +37 dBU (54.5V rms)
Microphone / line input 1:5.6   L2 – R2      +22 dBU  (9.7 V rms)    +37 dBU (54.5V rms)
Microphone / line input 1:11.2   L1 – R2     +16 dBU  (4.9 V rms)    +37 dBU (54.5V rms)