Трансформатор LUNDAHL LL1578XL. Инструкция на английском языке

Tibeliusgatan 7                        International    Domestic
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Microphone Input Transformers, Line-box Transformers
LL1578 and LL1578XL
The LL1578 and the LL1578XL are high performance microphone input transformers/line-box transformers with high
permeability mu-metal cores and high bandwidth coils. The LL1578 and the LL1578XL use the same pin-out as our
well known microphone transformer LL1538.
In the LL1578XL the core is about 45% larger than in the LL1578, resulting in a higher signal level capability. 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    LL1578                       2                   6
2               6
4
5
1              5
3                   8
Turns ratio  Spacing between   Spacing between  Recommended PCB   Isolation between windings /
pins              rows of pins     hole diameter     between windings and shield
1 + 1 : 10   5.08 mm  (0.2")   27.94 mm  (1.1")  1.5 mm           4 kV / 2 kV
LL1578             LL1578XL
Dimensions                                            38 x 24 x 17        38 x 24 x 20.5
Max. Length x Width x Height above PCB (mm)
Weight                                                46 g                65 g
Static resistance of each primary                     12 W                15 W
Static resistance of secondary                        880 W                960 W
Primary level at 0.2 % THD, 50 Hz signal              -5 dBU              0 dBU
Primaries connected in parallel (fig b), source impedance 50W  (sec. level +15 dBU)  (sec. level +20 dBU)
Primary level at 1 % THD, 50 Hz signal                + 4 dBU             +12 dBU
Primaries connected in parallel (fig b), source impedance 50W  (sec. level +24 dBU  (sec level +32 dBU)
Frequency response +/- 0.5 dB to balanced input       30Hz – 20kHz        20Hz – 20kHz
Signal level 0 dBU, source 200 W,  fig b, no termination
Frequency response +/- 0.5 dB to balanced input       10Hz – 70kHz        6Hz – 50kHz
Signal level -10 dBU, source 50 W,  fig b, load:      40 k W + 200pF      50 k W + 200pF
Connection alternatives     Component side
4              8
4              8
3   LL1578
3   LL1578
2              6
2              6
1              5
1              5
Fig. a. Primaries in series.                 Fig. b. Primaries in parallel.
Turns ratio 1 : 5                           Turns ratio 1 : 10
R980403