Lundahl ll1538 Transformer: Specifications and Uses

Powerful

Precise

Reliable

Versatile

Compact

The LL1538 and the LL1538XL are high performance microphone input transformers, each with a high permeability mu-metal core and two three-section coils.

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.

Technical Specifications

• 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

  
  

These specifications contribute to the transformer's long lifespan and reliable operation in demanding environments.

Applications and Uses

Essential

Flexible

Professional

Audio-centric

Innovative

The Lundahl LL1538 transformer is widely used in:

• Microphone preamplifiers

• Headphone amplifiers

• Audio interfaces

• Balanced line drivers

• High-end audio equipment

  
  

Its ability to maintain signal integrity makes it ideal for studio and live sound applications. It also excels in reducing noise and interference in sensitive audio circuits.

Installation and Integration Tips

Simple

Effective

Safe

Precise

Clean

When integrating the transformer:

1. Ensure correct polarity to avoid phase issues.

2. Use shielded cables to minimise interference.

3. Mount securely to prevent mechanical vibrations.

4. Maintain proper ventilation to avoid overheating.

5. Follow manufacturer wiring diagrams closely.

   
   

These steps guarantee optimal performance and longevity.

Final Thoughts on Lundahl ll1538

Trusted

Efficient

Clear

Stable

Essential

The lundahl ll1538 transformer stands out as a reliable component for audio professionals and enthusiasts. Its precise engineering and robust design make it a valuable addition to any high-quality audio system. Consider it for projects requiring superior sound fidelity and durability.