Трансформатор LUNDAHL LL1576. Инструкция на английском языке

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Microphone Input Transformers, Line-box Transformers
LL1576 and LL1577
The LL1576 and the LL1577 are high performance microphone input transformers/line-box transformers with high
permeability mu-metal cores and high bandwidth coils. The LL1576 and the LL1577 use the same pin-out as our well
known microphone transformer LL1538.
In both types, primary and secondary windings are separated by electrostatic shields. The very low leakage inductance
and thus excellent frequency response is achieved by a two-coil, three-section per coil winding structure.
The transformers are encapsulated in mu-metal cases for magnetic shielding.
Pin layout (component side view) and winding schematics:
1
4               8
3    LL1576                       2                   6
2               6
4
5
1              5
3                   8
Dimensions              Spacing         Spacing between  Recommended PCB      Weight
Max. Length x Width x   between pins    rows of pins     hole diameter
Height above PCB (mm)
38 x 24 x 17            5.08 mm  (0.2")  27.94 mm  (1.1")  1.5 mm             46 g
LL1576              LL1577
Turns ratio                                           1 + 1 : 7           1 + 1 : 14
Static resistance of each primary                     50 W                12 W
Static resistance of secondary                        1.5 kW               1.5 kW
Primary level at 0.2 % THD, 50 Hz signal              +2 dBU              -4 dBU
Primaries connected in parallel (fig b), source impedance 50W  (sec. level +19 dBU)  (sec. level +19 dBU)
Primary level at 1 % THD, 50 Hz signal                + 12 dBU            +6 dBU
Primaries connected in parallel (fig b), source impedance 50W  (sec. level +29 dBU  (sec level +29 dBU)
Frequency response +/- 0.5 dB to balanced input       15Hz – 50kHz        30Hz – 12kHz
Signal level 0 dBU, source 200 W,  fig b, no termination
Frequency response +/- 0.5 dB to balanced input       5Hz – 40kHz         10Hz – 50kHz
Signal level -10 dBU, source 50 W,  fig b, load:      30 kW + 200pF       80 kW + 100pF
Isolation between windings / between windings and shield  4 kV / 2 kV     4 kV / 2 kV
Connection alternatives     Component side
4              8
4              8
3   LL1576
3   LL1576
2              6
2              6
1              5
1              5
Fig. a. Primaries in series.                Fig. b. Primaries in parallel.
Turns ratio 1 : 3.5 with LL1576               Turns ratio 1 : 7 with LL1576
Turns ratio 1 : 7 with LL1577               Turns ratio 1 : 14 with LL1577
The transformers are often used reversed  (7:1 or 14:1) for example in line boxes.
R980402