Lundahl LL1538 Microphone Input Transformer

In the LL1538XL the core is about 45% larger than in the LL1538, resulting in a larger level capability. In both types, 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 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")
• Weight: 46 g
• Rec. PCB hole diameter: 1.5 mm
• Static resistance of each primary: 44 Ohms
• Static resistance of each secondary: 880 Ohms
• Distortion (primaries connected in parallel, source impedance 200W ): 0.2 % @ 0 dBU
• Self resonance point: > 120 kHz
• Optimum termination for best square-wave response (Connection 1:5, source imp. 200W ): No termination necessary
• Frequency response (source 200 W, no termination): 10 Hz - 100 kHz +/- 0.3 dB
• Isolation between windings/ between windings and shield: 4 kV / 2 kV