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Руководство пользователя LUNDAHL LL7902. Основные функции, характеристики и условия эксплуатации изложены на 2 страницах документа в pdf формате.
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Tibeliusgatan 7 International Domestic LUNDAHL SE-761 50 NORRTALJE Phone +46 - 176 13930 0176-13930 TRANSFORMERS SWEDEN Fax +46 - 176 13935 0176-13935 Line Input / General Purpose Transformers LL7901 and LL7902 LL7901 and LL7902 are large size, high level, high performance audio transformers, made for extraordinary requirements. The LL7901 has an extreme level capability ( + 34 dBU @ 50 Hz) while the LL7902 combines high level capability (+28 dBU @ 50 Hz) with low copper resistance. The transformer consists of two coils each with two primary and two secondary windings separated by electrostatic shields. The core is a high permeability mu metal lamination core. The transformers are magnetically shielded by a mu metal case. Turns ratio: 1 + 1 + 1 + 1 : 1 + 1 + 1 + 1 Dims (Length x Width x Height above PCB (mm)): 66 x 32 x 21 Pin layout (viewed from pins side) and winding schematics: 14 7 15 Coil 1 8 1 7 13 19 1 13 + Core & Can 2 8 14 20 2 20 15 21 21 16 22 24 5 11 17 23 6 23 6 12 18 24 5 12 16 Coil 2 11 18 17 Spacing between pins: 5.08 mm (0.2") Spacing between rows of pins: 5.08 / 45.72 mm (0.2 / 1.8") Weight: 155 g Rec. PCB hole diameter: 1.5 mm LL7901 LL7902 Static resistance of each primary (average): 120W 28W Static resistance of each secondary 125W 28W (average): Distortion (primaries connected in series, + 20 dBU primary level, 50 Hz: + 10 dBU primary level, 50 Hz: source impedance 600W ): 0.1 % 0.1 % + 34 dBU primary level, 50 Hz: 1 + 28 dBU primary level, 50 Hz: 1 % % Self resonance point : > 80 kHz > 150 kHz Optimum termination for best square- wave response 12 kW in series with 1.7 nF 5 kW in series with 1.3 nF (source imp. 600W ) : Frequency response 10 Hz - 55 kHz +/- 0.5 dB 10 Hz - 100 kHz +/- 0.5 dB (source and load as above) Isolation between primary and secondary windings/ between windings and shield: 4 kV / 2 kV R030218
LUNDAHL TRANSFORMERS Connection alternatives, LL7901 and LL7902 Left side connections NOTE! Pin side view + + + 1 7 1 7 1 7 2 8 2 8 2 8 5 11 5 11 5 11 6 12 6 12 6 12 L4 L2 L1 Right side connections NOTE! Pin side view 13 19 + 13 19 + 13 19 + 14 20 14 20 14 20 15 21 15 21 15 21 16 22 16 22 16 22 17 23 17 23 17 23 18 24 18 24 18 24 R4. Center tap at 17 R2. Center tap at 20+23 R1 Suggested applications using LL7901 and LL7902 Application Max primary level, Transformer Connections < 1% THD@50 Hz Very high level input stage 1:1 +34 dBU LL7901 L4 - R4 Very high level input stage 1:2 +28 dBU LL7901 L2 - R4 Very high level input stage 2:1 +34 dBU LL7901 L4 - R2 High level isolation unit 1:1 +28 dBU LL7902 L4 - R4 High level isolation unit 1:1 +22 dBU LL7902 L2 - R2 Reduced copper resistance Low resistance isolation unit 1:1 +16 dBU LL7902 L1- R1 (Transformer copper resistance 14 ohms) Microphone / line input 1:2 +22 dBU LL7902 L2 - R4 Microphone / line input 1:4 +16 dBU LL7902 L1 - R4