Lundahl Microphone Transformer, LL1578
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  • Lundahl Microphone Transformer, LL1578

Lundahl Microphone Transformer, LL1578

LL1578
€70.35 Tax excluded
85.83 € tax incl. for EU buyers
Lundahl Microphone Transformer, LL1578
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Microphone Input Transformers, Line-box Transformers LL1578 and LL1578XL

The LL1578 and the LL1578XL are high performance microphone input transformers/line-box transformers with high permeability mu-metal cores and high bandwidth coils. The LL1578 and the LL1578XL use the same pin-out as our well known microphone transformer LL1538.

In the LL1578XL the core is about 45% larger than in the LL1578, resulting in a higher signal level capability. 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.

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
Isolation between windings / between windings and shield: 4 kV / 2 kV

LL1578

LL1578XL

Dimensions Max. Length x Width x Height above PCB (mm)

38 x 24 x 17

38 x 24 x 20.5

Weight

46 g

65 g

Turns ratio

1 + 1 : 10

1 + 1 : 10

Static resistance of each primary:

12 ?

15 ?

Static resistance of secondary:

880 ?

960 ?

Primary level at 0.2 % THD, 50 Hz signal Primaries connected in parallel (fig b), source impedance 50?

-5 dBU
(sec. level +15 dBU)

0 dBU
(sec. level +20 dBU)

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

+ 4 dBU
(sec. level +24 dBU

+12 dBU
(sec level +32 dBU)

Frequency response +/- 0.5 dB to balanced input Signal level 0 dBU, source 200 ?, fig b, no termination

30Hz 20kHz

20Hz 20kHz

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

Frequency response +/- 0.5 dB to balanced input Signal level -10 dBU, source 50 ?, fig b, load:

10Hz 70kHz 40 k ? + 200pF

6Hz 50kHz 50 k ? + 200pF
LL1578
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