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LUNDAHL LL1684 Audio Transformer (Unit)
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LUNDAHL LL1684 Audio Transformer (Unit)
The Lundahl LL1684 is a high-performance general-purpose amorphous core transformer that can be used for microphone or line inputs, line outputs, and galvanic isolation. The windings are arranged to provide perfect symmetry when the transformer is used in phase-splitting input applications. The dual-coil structure also significantly improves immunity to external magnetic fields generated by power supplies and motors, for example. The primary and secondary windings are separated by electrostatic shields. The transformer is housed in a mu-metal enclosure.
Technical Specifications
| Specifications | |
|---|---|
| Product type | Audio transformer |
| Turns ratio | 1 + 1 : 1 + 1 |
| DC resistance of each primary winding | 41Ω |
| DC resistance of each secondary winding | 41Ω |
| Distortion (primary windings connected in series, 150Ω source impedance) | +23dBU 0.1% at 50Hz +25dBU <1% at 50Hz |
| Distortion (primary windings connected in parallel, 150Ω source impedance) | +16dBU 0.1% at 50Hz +19dBU <1% at 50Hz |
| Self-resonant frequency | >250kHz |
| Frequency response (150Ω source, 10kΩ load, series connection) | 10Hz-100kHz ±1.0dB |
| Phase response (deviation from linear phase) | 20Hz–20kHz, ±0.5° |
| Recommended load for optimum square-wave response | 10kΩ // 1kΩ + 3nF |
| Insulation between windings / between windings and shield | 3kV / 1.5kV |
| General | |
|---|---|
| Dimensions | 42 x 28 x 22mm |
| Pin spacing | 5.08mm (0.2") |
| Row spacing | 30.5mm (1.2") |
| Recommended PCB hole diameter | 1.5mm |
| Weight | 81g |
| Package contents | 1x LUNDAHL LL1684 |
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