Трансформатор LUNDAHL LL1583. 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
LL1583
Small Size Splitting Transformer
In many splitting applications, the splitting transformer must have a high immunity to input common mode signals, to
stray magnetic fields from e.g. power transformers and to large ground potential differences in receiving systems.
In the design of the LL1583, we have used our well established two coil structure to create a transformer with a high
degree of symmetry. The transformer is built up from two primary windings  (which should be used in parallel) and two
secondary windings. Each secondary winding is built up from two sections, one from each coil. Its own electrostatic
shields surround each secondary section. The symmetric structure results in an internal cancellation of noise signals
caused by external magnetic field. It also increases immunity to ground noise between secondary systems and reduces
the effects of input common mode signals.
The transformer is housed in a mu-metal can and is impregnated in solventless epoxy resin.
Pin layout (viewed from component side) and (simplified) winding schematics:
5 (+ core)
10
3
5       10
9                     1                      7
LL1583
3  (top view)  8
2        7                                            6
1        6                     2
9
8 (+ can)
Spacing between pins              Spacing between                   Recommended
rows of pins                   PCB hole diameter:
2.54 mm  (0.1")             20.32 mm  (0.8")                      1.3 mm
Turns ratio:                                                     1 : 1 + 1
Dimensions (Max. L x W x H above PCB(mm))                        28 x 17 x 15
Weight:                                                          25 g
Static resistance of  primary (in parallel)                      56 W
Static resistance of each secondary  (Pins 10 to 7 and pins 6 to 9):  95 and 130 W
Self resonance point :                                           > 200 kHz
Distortion                                                       0.1% @ -2 dBU,  50 Hz
1  % < @  8 dBU, 50 Hz
Frequency response (Ref : -6 dBu, 1kHz)                          10 Hz -- 120 kHz +/- 0.5 dB
Test arrangement: Parallel input - parallel output . Source 150W  , load 10 kW
CMRR  at 20 kHz  (Source 600 ohms, load 2 x 10k)                 > 60 dB
CMRR at 20 kHz from sec. to sec.  (Source 600 ohms, load 2 x 10k)  > 40 dB
Isolation test  primary - secondary  / secondary - secondary / E1 - E2  4 kV / 2 kV / 1 kV  RMS
Application example. Component side view.
Splitting 1: 1 + 1
Primary signal from
microphone cable, with or
without phantom power.
5       10   +                             +
9
LL1583
3  (top view)  8
2        7
+                   +         1        6   +                             +
NOTE! Pins 1 and 3 must be       Secondaries can be connected individually.
connected!                  (Function does not require that both
secondaries are connected/used)
R990514
LL1583
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LL1583 application example.
1 + 2 Out Splitting box                        Front house
desk.
With phantom
On stage mic.
power supply
1
2
3
Before connecting  splitting box
With splitting box
Front house desk.
With phantom
power supply
On stage mic.
1
3
2
Direct output
2   3   1     1   3   2
Splitting box
1     2        3
LL1583
9  6    8       5  10  7
SW1
SW2
3   2   1      1   2   3
Monitor                                                                              Recording
Desk      3                                                                        3  Truck
2                                                                        2
1                                                                        1
Ideally, SW1 and SW2 should be open.
If, however, pin 8 and/or pin 5 do not receive ground reference from Monitor
desk or from Recording truck, close SW1 and/or SW2                 R990618
LL1583
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