LL1578XL
Microphone Input Transformer
The LL1578XL is a high performance microphone input transformers/line-box transformers with high permeability mu-metal cores and high bandwidth coils. The LL1578XL uses the same pin-out as our well known microphone transformer LL1538.
The LL1578XL core is about 45% larger, resulting in a higher signal level capability. The 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 transformer is encapsulated in mu-metal cases for magnetic shielding.
| Spacing between pins | Spacing between rows of pins | Weight | Recommended PCB hole diameter |
| 5.08mm (0.2") | 27.94 mm (1.1") | 65g | 1.5mm |
| Static resistance of each primary: | 15 Ω |
| Static resistance of each secondary : | 960 Ω |
| Dimensions:(Length x Width x Height above PCB) | 38 x 24 x 20.5 (mm) |
| Turns ratio | 1+1 : 10 |
| Primary level at 0.2 % THD, 50 Hz signal (Primaries connected in parallel, source impedance 50Ω) |
0 dBU (sec. level +20 dBU) |
| Primary level at 1 % THD, 50 Hz signal (Primaries connected in parallel, source impedance 50Ω) |
+ 12 dBU (sec. level +32 dBU |
| Frequency response +/- 0.5 dB to balanced input (Signal level 0 dBU, source 200Ω, no termination) |
20 Hz ~ 20 kHz |
| Frequency response +/- 0.5 dB to balanced input (Signal level -10 dBU, source 50Ω, load:) |
6 Hz ~ 50 kHz, 50 kΩ + 200 pF |
| Isolation between windings / between windings and shield : | 4 kV / 2 kV |
Associated downloads
