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Lundahl Microphone Transformer, LL1577

LL1577

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Lundahl Microphone Transformer, LL1577

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85,83 €

70,35 € tax excl.***

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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
(sec. level +19 dBU)

-4 dBU
(sec. level +19 dBU)

Primary level at 1 % THD, 50 Hz signal Primaries connected in parallel (fig b), source impedance 50?

+ 12 dBU
(sec. level +29 dBU)

+6 dBU
(sec level +29 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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Lundahl Microphone Transformer, LL1577

Lundahl Microphone Transformer, LL1577

Lundahl Microphone Transformer, LL1577