LL1577
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Microphone Input Transformers, Line-box Transformers LL1576 and LL1577
The LL1576 and the LL1577 are high performance microphone input transformers/line-box transformers with high permeability mu-metal cores and high bandwidth coils. The LL1576 and the LL1577 use the same pin-out as our well known microphone transformer LL1538.
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.
Dimensions Max. Length x Width x Height above PCB (mm): 38 x 24 x 17
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
Weight: 46 g
LL1576 | LL1577 | |
Turns ratio | 1 + 1 : 7 | 1 + 1 : 14 |
Static resistance of each primary: | 50 ? | 12 ? |
Static resistance of secondary: | 1.5 k? | 1.5 k? |
Primary level at 0.2 % THD, 50 Hz signal Primaries connected in parallel (fig b), source impedance 50? | +2 dBU | -4 dBU |
Primary level at 1 % THD, 50 Hz signal Primaries connected in parallel (fig b), source impedance 50? | + 12 dBU | +6 dBU |
Frequency response +/- 0.5 dB to balanced input Signal level 0 dBU, source 200 ?, fig b, no termination | 15Hz 50kHz | 30Hz 12kHz |
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 |
Isolation between windings / between windings and shield | 4 kV / 2 kV | 4 kV / 2 kV |
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