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LL7901
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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
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): | 120 ? | 28 ? |
Static resistance of each secondary (average): | 125 | 28 ? |
Distortion (primaries connected in series, source impedance 600 ? ): | + 20 dBU primary level, | + 10 dBU primary level, |
+ 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 squarewave response (source imp. 600 ?) : | 12 kW in series with 1.7 nF | 5 kW in series with 1.3 nF |
Frequency response (source and load as above) | 10 Hz - 55 kHz +/- 0.5 dB | 10 Hz - 100 kHz +/- 0.5 dB |
Isolation between primary and secondary windings/ between windings and shield: 4 kV / 2 kV
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