LL1527
General Purpose Transformers
For microphone or line input, for output and for galvanic isolation of units. LL1527 has been generally accepted by the audio industry as the general purpose audio transformer.
The LL1527 is built-up from two coils, each with one primary and one secondary winding separated by an electrostatic shield. The core is a high permeability mu metal core. The transformer is housed in a mu-metal can.
| Spacing between pins | Spacing between rows of pins | Offset of earth pins from adjacent row: | Recommended PCB hole diameter |
| 5.08mm (0.2") | 27.94 mm (1.1") | 2.54 mm (0.1") | 1.5mm |
| Dimensions (Max. L x W x H above PCB(mm) | 38 x 24 x 17 (mm) |
| Weight : | 48 g |
| Static resistance of each primary : | 43 Ω |
| Static resistance of each secondary : | 56 Ω |
| Self resonance point | > 200 kHz |
| Distortion | 0.1％＠ +6dBU, 50 Hz |
| <1％＠ +16dBU, 50 Hz | |
| Frequency response (Ref : 0 dBu, 1kHz) | 10 Hz ~ 150 kHz ±0.2dB |
| Optimum load for best square-wave response (sec. in series) : | 3 ~ 4 kΩ |
| Loss across transformer (at midband, with above termination) : | 0.4 dB |
| Isolation between windings/ between windings and shield : | 4 kV / 2kV |
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