Трансформатор LUNDAHL LL1935. Инструкция на английском языке

Tibeliusgatan 7                        International    Domestic
LUNDAHL                        S-761 50 NORRTALJE          Phone    +46 - 176 13930   0176-13930
TRANSFORMERS                SWEDEN                      Fax      +46 - 176 13935   0176-13935
DI Transformer
LL1935
LL1935 is a transformer designed for DI (Direct Input) applications, matching high impedance guitar pickups to
low impedance microphone preamp inputs, but is also ideal for 1:10 microphone input applications. The
transformer consists of two coils, each with one primary and one secondary winding separated by an
electrostatic shield, and a high permeability mu-metal core. The high impedance windings are wound using a
special low capacitance winding technique.  The transformer is encapsulated in a mu-metal case for magnetic
shielding.
For best performance, the high impedance side of the transformer (5 + 5) should be connected in series.
Turns  ratio:                                            1 + 1 : 5 + 5
Dims (Length x Width x Height above PCB (mm)):           38 x 23 x 16
Pin layout (viewed from component side) and winding schematics:
4                   8
4              8
3               7                3                   7
2               E   6            1                   5
1               5
2                   6
E
Spacing between pins:                              5.08 mm  (0.2")
Spacing between rows of pins:                      27.94 mm  (1.1")
Offset of earth pin from adjacent row:             2.54 mm (0.1")
Weight:                                            46 g
Recommended  PCB hole diameter:                    1.5 mm
Static resistance of each primary (pins 5-6 and 7-8):   650 ?
Static resistance of each secondary (pins 1-2 and 3-4):   17 ?
Frequency response  (reference 1.0 kHz)
10:1,  source 100 k?  , secondary open:            20 Hz –  20 kHz +0 / -3 dB
10:1, source 100 k?, load 1 k?                     10 Hz – 45 kHz +0 / -2 dB
1:10, source 200 ?,  secondary open                10 Hz – 80 kHz +/- 1dB
Distortion                                         -5 dBU input level, +14 dBU output level
For practical reasons measured in 1:10 configuration.   < 0.1% THD @ 50 Hz
Source 150?, load 10k (Audio Precision portable)   +7 dBU input level, +26 dBU output level
< 1% THD @ 50 Hz
Self resonance point :                             None detected in above configurations
Isolation between windings/ between windings and   4 kV / 2 kV
shield
Connection alternatives (Component side view):
5              1                            5              1
6              2                            6              2
E                                            E
7              3                            7              3
8              4                            8              4
5 : 1                                        10 : 1
R090415