Трансформатор LUNDAHL LL1538. Инструкция на английском языке

Tibeliusgatan 7                        International    Domestic
S-761 50 NORRTALJE          Phone    +46 - 176 13930   0176-13930
SWEDEN                      Fax      +46 - 176 13935   0176-13935
Microphone Input Transformers
LL1538 and LL1538XL
The LL1538 and the LL1538XL are high performance microphone input transformers, each with a high permeability
mu-metal core and two three-section coils.
In the LL1538XL the core is about 45%  larger than in the LL1538, resulting in a larger level capability. In both types,
primary and secondary windings are separated by  electrostatic shields. The three-section winding structure of the
transformers results in a very low leakage inductance and thus an excellent frequency response.
The transformers are encapsulated in mu-metal cases for magnetic shielding.
Turns ratio:                                                    1 + 1 : 5
Pin layout (viewed from component side) and winding schematics:
1
4              8
3                                 2                   6
LL 1538
2    (top view)   6
4
5
1               5
3                   8
LL1538                  LL1538XL
Dimensions  (Max. Length x Width x Height above  38 x 24 x 17          38 x 24 x 20.5
PCB (mm))
Spacing between pins                          5.08 mm  (0.2")          5.08 mm  (0.2")
Spacing between rows of pins                  27.94 mm  (1.1")         27.94 mm  (1.1")
Weight                                        46 g                     65 g
Rec. PCB hole diameter                        1.5 mm                   1.5 mm
Static resistance of each primary             44W                      61W
Static resistance of each secondary           880 W                    975 W
Distortion (primaries connected in parallel,  0.2 % @  0 dBU (0.775V   0.2 % @ + 3 dBU (1.1V
source impedance 200W )            rms) primary level, 50 Hz  rms) primary level, 50 Hz
1 % @ + 10 dBU (2.5 V    1 % @ + 13 dBU (3.5V rms)
rms) primary level, 50 Hz  primary level, 50 Hz
Self resonance point                          > 120 kHz                > 120 kHz
Optimum termination for best square-wave      No termination necessary  No termination necessary
response (Connection 1:5, source imp.  200W )
Frequency response (source 200 W, no termination)  10 Hz - 100 kHz +/- 0.3 dB  10 Hz - 80 kHz +/- 0.3 dB
Isolation between windings/ between windings and  4 kV / 2 kV          4 kV / 2 kV
shield
Connection alternatives
4              8                            4              8
3                                           3
2              6                            2               6
1              5                            1               5
1 : 2.5                                      1 : 5
R980616