Инструкция LUNDAHL LL7904

Инструкция

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Инструкция для LUNDAHL LL7904 на русском языке. Документ можно использовать для ознакомления с информацией, относящейся к данной модели.

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LL7904

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LL7904

High Level 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.

The LL7904 is developed to handle those types of problems. When designing the LL7904, 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 and is surrounded by it own electrostatic shields. The symmetric structure

results in an internal cancellation of noise signals caused by external magnetic field (humbucking). 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.

Turns ratio: 1 + 1 : 1 + 1

Pin layout (viewed from pins side) and simplified winding schematics:

Spacing between

pins

Spacing between

rows of pins

Recommended

PCB hole diameter:

5.08 mm (0.2") 5.08 / 45.72 mm (0.2 / 1.8") 1.7 mm

Dimensions (Max. L x W x H above PCB(mm))

66 x 32 x 21

Weight:

155 g

Static resistance of each primary:

55 Ω

Static resistance of each secondary (Pins 14 - 22 and pins 16 - 13 resp.):

43 Ω and 66 Ω

Distortion

0.1% @ +16 dBU, 50 Hz

< 1 % @ +23 dBU, 50 Hz

Frequency response (Ref : 0 dBu, 1kHz)

10 Hz -- 80 kHz +/- 0.5 dB

Test arrangement: Parallel input - parallel output . Source 150Ω , load 10 kΩ

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 / 18 - (15+17) 4 kV / 2 kV / 1 kV RMS

Splitting 1: 1 + 1

R001110





Tibeliusgatan 7 International Domestic

S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930

SWEDEN Fax +46 - 176 13935 0176-13935

18 (+ core)

Application example.

Secondaries can be connected individually.

(Function does not require that both

secondaries are connected/used)

Primary signal from

microphone cable, with or

without phantom power.

126

115

1913

2014

2115

2216

2317

2418

15 (use with 17) Housing

Note! Pin’s side view

LL7904

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Инструкция LUNDAHL LL7904

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