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Инструкция LUNDAHL LL1550

Инструкция ФорматPDF Размер0,09 МБ Страниц2 КатегорияИнструменты / Контрольно-измерительные приборы ДобавилLeoBook850

Инструкция для LUNDAHL LL1550 на русском языке. Документ можно использовать для ознакомления с информацией, относящейся к данной модели.

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Audio Transformer
LL1550
LL1550 is an audio transformer with rather high turns ratio and with a variety of connection alternatives. The
transformer is built up from two coils, each with a secondary winding surrounded by shields and two primary
windings. This structure results in an excellent frequency response. All winding ends are available on the pins.
The transformer is ideally used in applications where the high turns ratio is utilized, e.g. in a D.I. box.
The LL1550 is made with amorphous core material. As this type of core does not store energy (unlike
conventional mu-metal cores) the low frequency resonance with external capacitors is practically eliminated.
Refer to the backside of this sheet for termination alternatives.
Turns ratio: 1 + 1 + 1 + 1 : 4 + 4
Dims: (Length x Width x Height above PCB (mm)) 30 x 22.5 x 14.5
Pin Layout (viewed from pins side) and Windings Schematics:
Spacing between pins: 2.54 mm (0.1")
Spacing between rows of pins: 22.86 mm (0.9")
Weight: 30 g
Rec. PCB hole diameter: 1.5 mm
Static resistance of each
primary (average): 33 Ω
Static resistance of each
secondary (average): 265 Ω
Self-resonance point: > 280 kHz
Recommended load for best square-wave response
(Termination alternative A below): 6.7 kΩ + 470 pF
Frequency response
(source 150Ω , load (6.7 kΩ + 470 pF) in parallel with 56 kΩ ): 10 Hz - 70 kHz +/- 0.5 dB @ 0 dBU
Loss across transformer (at midband with termination as above): 0.3 dB
Core: Amorphous Strip
Isolation between windings / between windings and shields: 3 kV / 1.5 kV
Data at different termination alternatives, showed on the back side of this sheet:
Termination
Alternative
Turns
ratio
Copper Resistance
prim/sec
Idle impedance
@40 Hz, 0dBU
Suggested Use THD < 0.5%@40 Hz
primary level /
real source impedance
A 1:2
130Ω / 530Ω 40kΩ / 160kΩ 600 Ω / 10 kΩ 12 dBU / 150Ω
B 1:2
33Ω / 133Ω 10kΩ / 40kΩ 200Ω / 10 kΩ 6 dBU / 40Ω
C 1:4
33Ω / 530Ω 10kΩ / 1600kΩ 200Ω / 5kΩ 6 dbU / 40Ω
D 1:4
8Ω / 133Ω 2.5kΩ / 40kΩ 200Ω / 1kΩ -1 dBU / 10Ω
E 1:8
8Ω / 530Ω 2.5kΩ / 160kΩ 200Ω / 10kΩ -1 dBU / 10Ω
F (Split) 4:1+1 530Ω / 66Ω + 66Ω
G (Split) 1:2+2 33Ω / 265Ω + 265Ω Left side can also be connected as B
CenterTap
(1:1+1) or D (1:2+2)
.
R940912
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Tibeliusgatan 7 International Domestic
S-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930
SWEDEN Fax +46 - 176 13935 0176-13935
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