LL1538
Microphone Input Transformer
The LL1538 is a high performance microphone input transformers with a high permeability mu-metal core and two three-section coils.
LL1538 primary and secondary windings are separated by electrostatic shields. The three-section winding structure of the transformers results in a very low leakage inductance and thus an excellent frequency response.
The transformer is encapsulated in mu-metal cases for magnetic shielding.
| Spacing between pins | Spacing between rows of pins | Weight | Recommended PCB hole diameter |
| 5.08mm (0.2") | 27.94 mm (1.1") | 46g | 1.5mm |
| Static resistance of each primary: | 44 Ω |
| Static resistance of each secondary : | 880 Ω |
| Dimensions:(Length x Width x Height above PCB) | 38 x 24 x 17 (mm) |
| Self resonance point | > 120 kHz |
| Distortion (primaries connected in parallel, source imp. 200Ω) | 0.2 % @ 0 dBU (0.775V rms) primary level, 50 Hz |
| 1 % @ + 10 dBU (2.5 V rms) primary level, 50 Hz | |
| Optimum termination for best square-wave response : | No termination necessary |
| Frequency response (source 200Ω, no termination) | 10 Hz - 100 kHz +/- 0.3 dB |
| Isolation between windings / between windings and shield : | 4 kV / 2 kV |
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