EI48 14mH 10VA Signal Isolation Audio Transformer For Professional Audio Mixer
The EI48 Audio Transformer is a high-performance magnetic component designed for precision signal coupling and impedance matching in professional audio systems. Utilizing a high-permeability EI48 laminated core, this transformer is optimized for low-level signal processing where preserving the harmonic richness and tonal balance of the source material is paramount. Whether used for balancing unbalanced lines or as an output stage for small amplifiers, the EI48 provides a transparent electrical interface that eliminates ground loops and common-mode noise.
| Parameter | Typical Value / Spec |
|---|---|
| Core Type | EI48 Laminated Core |
| Mounting Type | Vertical / Horizontal PCB Mount / Lead Wire |
| Shielding | Optional Mu-metal / Steel Case Shielding |
| Dimensions | Approx. 48.0mm x 40.0mm x 42.0mm (Standard) |
| Frequency Response | 20Hz - 20KHz (+/- 1.0dB) |
| Impedance Matching | 600:600 / 10K:10K / 600:10K (Customizable) |
| THD (Distortion) | < 0.1% (at 1KHz, 0dBm) |
| Insertion Loss | < 1.5 dB (at 1KHz) |
| Phase Shift | < 5 Degrees (at 20Hz - 20KHz) |
| Power Handling | 50mW - 5W (Depending on stack) |
| Hi-Pot (Isolation) | 1.5KV - 2.5KV AC / 1min |
| Insulation Resistance | >=100MΩ (at 500V DC) |
| Core Material | Laminated Silicon Steel / Permalloy (Ni-Fe) |
| Winding Wire | 100% Pure Copper / Oxygen-Free Copper (OFC) |
| Insulation Class | Class B (130°C) |
| Operating Temp | ~20°C to +85°C |
| Compliance | RoHS, REACH, CE |
- Ultra-Wide Frequency Response: Specifically wound to achieve a flat response from 20Hz to 20KHz, ensuring that both deep low-end transients and high-frequency harmonics are reproduced accurately.
- Premium Magnetic Materials: Available with high-permeability silicon steel or specialized Permalloy (nickel-iron) cores to maximize inductance while minimizing total harmonic distortion (THD).
- Precision Winding Symmetry: Features bifilar or sectional winding techniques to ensure perfect phase alignment and minimal inter-winding capacitance.
- Low Insertion Loss: Utilizing high-purity Oxygen-Free Copper (OFC) wire to ensure maximum signal transfer efficiency and improved signal-to-noise ratio.
The core material dictates the "sonic signature" and technical limits of the transformer. Standard Silicon Steel is excellent for higher-level signals and output stages as it has a high saturation flux density, making it resistant to clipping at high volumes. However, for low-level studio or microphone signals, Permalloy is preferred because its significantly higher initial permeability allows the EI48 to maintain high primary inductance at very low signal levels. This results in much lower THD at low frequencies (20Hz -100Hz), where standard steel cores might introduce subtle non-linearities and bass roll-off.
- Professional Audio Mixers: Used for line-level signal isolation and matching between different console stages.
- Vacuum Tube Amplifiers: Ideal as a high-quality inter-stage or headphone output transformer for high-fidelity tube designs.
- DI Boxes & Signal Isolators: Provides complete galvanic isolation to break ground loops in complex stage and studio setups.
- Broadcast Equipment: Reliable signal transmission for radio and television infrastructure requiring stable impedance across the audio spectrum.
In high-fidelity audio, high inter-winding capacitance can act as a low-pass filter or cause resonant "ringing" at the upper edge of the frequency spectrum. To mitigate this, our EI48 transformers employ sectionalized winding structures where the primary and secondary are split into multiple layers. This technique drastically reduces distributed capacitance, pushing the resonant frequency well above the audible range (typically >50KHz). This ensures a smooth high-frequency roll-off and excellent phase linearity, which is critical for maintaining accurate spatial imaging and "soundstage" in stereo applications.
- Exceptional Noise Immunity: The combination of a tight magnetic circuit and optional Mu-metal shielding provides an effective barrier against external EMI and RFI hum, even in high-interference environments.
- Superior Galvanic Isolation: With a dielectric strength of up to 2.5kV AC, it protects sensitive digital audio workstations (DAWs) and processors from high-voltage surges and ground potential differences.
- Time-Proven Reliability: Constructed with vacuum-impregnated insulation and high-grade materials, the EI48 is designed for decades of consistent performance without sonic degradation.
- Standardized Mounting: The compact EI48 footprint fits easily into 1U rack-mount equipment and compact pedalboards and desktop audio interfaces, and high-density PCB layouts.
Chipsen Electronics Technology Co., Ltd., established in 2000, is a specialized manufacturer of high frequency transformer, low frequency transformer, toroidal inductor, SMD power inductor, super high current inductor, choke coil and switch. Chipsen has got a good reputation in domestic and oversea markets which include North & South America, Europe and Southeast Asia.
Chipsen possesses a professional management team, as an ISO9001, ISO14001 & IATF16949 audited company, which always commits to producing environmental protection and qualified products. Our products are certified by UL Class B/Class F/Class H, CQC and RoHS, and obtained 21 patents.
These achievements mainly come from our strong R&D team, providing various solutions for temperature decreasing, noise cancellation and coupled radiation conductivity. Our products widely used in various fields of new energy, PV, UPS, Robotics, smart home, security systems, health care and communication.
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