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Руководство пользователя LUNDAHL LL1550. Основные функции, характеристики и условия эксплуатации изложены на 2 страницах документа в pdf формате.
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Tibeliusgatan 7 International Domestic S-761 50 NORRTALJE Phone +46 - 176 13930 0176-13930 SWEDEN Fax +46 - 176 13935 0176-13935 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: 1 9 1 9 2 2 10 10 3 11 3 4 4 5 13 5 13, 14 6 14 6 7 15 15 8 16 7 16 8 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 W Static resistance of each secondary (average): 265 W Self-resonance point: > 280 kHz Recommended load for best square-wave response (Termination alternative A below): 6.7 kW + 470 pF Frequency response (source 150W , load (6.7 kW + 470 pF) in parallel with 56 kW ): 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 Turns Copper Resistance Idle impedance Suggested Use THD < 0.5%@40 Hz Alternative ratio prim/sec @40 Hz, 0dBU primary level / real source impedance A 1:2 130W / 530W 40kW / 160kW 600 W / 10 kW 12 dBU / 150W B 1:2 33W / 133W 10kW / 40kW 200W / 10 kW 6 dBU / 40W C 1:4 33W / 530W 10kW / 1600kW 200W / 5kW 6 dbU / 40W D 1:4 8W / 133W 2.5kW / 40kW 200W / 1kW -1 dBU / 10W E 1:8 8W / 530W 2.5kW / 160kW 200W / 10kW -1 dBU / 10W F (Split) 4:1+1 530W / 66W + 66W G (Split) 1:2+2 33W / 265W + 265W Left side can also be connected as B (1:1+1) or D (1:2+2) CenterTap . R940912
LL1550 Termination Alternatives (Left side is input if not stated otherwise) !!!!! Pin’s side views !!!!! 1 9 1 9 2 10 2 10 3 A 11 3 11 4 4 5 CENTER TAP 13 5 A 13 6 14 6 14 7 15 7 15 8 16 8 16 CT 1 9 1 9 2 10 2 10 3 11 3 B 11 4 B CT 4 5 13 5 CENTER TAP 13 6 14 6 14 7 15 7 15 8 16 8 16 1 9 1 9 2 10 2 10 3 11 3 C 11 4 C CT 4 5 13 5 13 6 14 6 CENTER TAP 14 7 15 7 15 8 16 8 16 1 9 1 9 2 10 10 3 11 2 11 3 4 5 D 13 4 E 6 14 5 13 7 15 6 14 8 16 7 15 8 16 1 9 1 9 OUT 1 2 F 10 2 10 OUT 1 3 11 3 11 4 SPLIT IN 4 G 5 13 5 13 OUT 2 6 14 6 SPLIT 14 7 15 7 15 8 16 8 16 OUT 2 R940324