LL1578
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Microphone Input Transformers, Line-box Transformers LL1578 and LL1578XL
The LL1578 and the LL1578XL are high performance microphone input transformers/line-box transformers with high permeability mu-metal cores and high bandwidth coils. The LL1578 and the LL1578XL use the same pin-out as our well known microphone transformer LL1538.
In the LL1578XL the core is about 45% larger than in the LL1578, resulting in a higher signal level capability. In both types, primary and secondary windings are separated by electrostatic shields. The very low leakage inductance and thus excellent frequency response is achieved by a two-coil, three-section per coil winding structure. The transformers are encapsulated in mu-metal cases for magnetic shielding.
Spacing between pins: 5.08 mm (0.2")
Spacing between rows of pins: 27.94 mm (1.1")
Rec. PCB hole diameter: 1.5 mm
Isolation between windings / between windings and shield: 4 kV / 2 kV
LL1578 | LL1578XL | |
Dimensions Max. Length x Width x Height above PCB (mm) | 38 x 24 x 17 | 38 x 24 x 20.5 |
Weight | 46 g | 65 g |
Turns ratio | 1 + 1 : 10 | 1 + 1 : 10 |
Static resistance of each primary: | 12 ? | 15 ? |
Static resistance of secondary: | 880 ? | 960 ? |
Primary level at 0.2 % THD, 50 Hz signal Primaries connected in parallel (fig b), source impedance 50? | -5 dBU | 0 dBU |
Primary level at 1 % THD, 50 Hz signal Primaries connected in parallel (fig b), source impedance 50? | + 4 dBU | +12 dBU |
Frequency response +/- 0.5 dB to balanced input Signal level 0 dBU, source 200 ?, fig b, no termination | 30Hz 20kHz | 20Hz 20kHz |
Frequency response +/- 0.5 dB to balanced input Signal level -10 dBU, source 50 ?, fig b, load: | 5Hz 40kHz 30 k? + 200pF | 10Hz 50kHz 80 k? + 100pF |
Frequency response +/- 0.5 dB to balanced input Signal level -10 dBU, source 50 ?, fig b, load: | 10Hz 70kHz 40 k ? + 200pF | 6Hz 50kHz 50 k ? + 200pF |
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