Lundahl Microphone Transformer, LL1538
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  • Lundahl Microphone Transformer, LL1538

Lundahl Microphone Transformer, LL1538

LL1538
€70.35 Tax excluded
85.83 € tax incl. for EU buyers
Lundahl Microphone Transformer, LL1538
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Microphone Input Transformers LL1538 and LL1538XL

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.

Turns ratio: 1 + 1 : 5

LL1538

LL1538XL

Dimensions (Max. L x W x H above PCB(mm)):

38 x 24 x 17

38 x 24 x 20.5

Spacing between pins

5.08 mm (0.2")

5.08 mm (0.2")

Spacing between rows of pins

27.94 mm (1.1")

27.94 mm (1.1")

Weight:

46 g

65 g

Rec. PCB hole diameter

1.5 mm

1.5 mm

Static resistance of each primary:

44 ?

61 ?

Static resistance of each secondary:

880 ?

975 ?

Distortion (primaries connected in parallel, source impedance 200?)

0.2 % @ 0 dBU (0.775V rms) primary level, 50 Hz
1 % @ + 10 dBU (2.5 V rms) primary level, 50 Hz

0.2 % @ + 3 dBU (1.1V rms) primary level, 50 Hz
1 % @ + 13 dBU (3.5V rms) primary level, 50 Hz

Self resonance point:

> 120 kHz

> 120 kHz

Optimum termination for best square-wave response (Connection 1:5, source imp. 200? )

No termination necessary

No termination necessary

Frequency response (source 200 ?, no termination)

10 Hz - 100 kHz +/- 0.3 dB

10 Hz - 80 kHz +/- 0.3 dB

Isolation between windings/ between windings and shield

4 kV / 2 kV

4 kV / 2 kV
LL1538
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