Product Specification

EI28 600:600 Permalloy Audio Transformer Isolation Transformer Soft feet 2+2

1.Product Description

This EI28 600:600 audio isolation transformer uses high-performance Permalloy as the magnetic core material, known for its extremely high magnetic permeability, which can achieve excellent low-frequency response and extremely low magnetic core loss in a small volume. Its 600 Ω: The impedance design of 600 Ω is optimized for professional audio signal transmission, which can effectively transmit audio frequency signals. At the same time, it completely cuts off the grounding circuit between devices through magnetic and electric isolation, eliminating annoying AC hum. The transformer adopts the classic EI28 size specification, achieving a good balance between performance and volume, and is equipped with 2+2 pins (two primary and two secondary pins each) that are easy to weld. The "soft foot" (rubber foot pad) design of its housing can effectively reduce mechanical vibration transmission and improve the ability to resist micro sound effects. It is an ideal choice for low-level audio circuit isolation applications that pursue high fidelity sound quality and pure signals.

1. Core function: signal isolation and noise cancellation

Cutting off the grounding circuit: This is the most important function. When multiple audio devices are connected, different ground potentials form a "ground loop", resulting in low-frequency AC humming (50/60Hz humming). The transformer transmits signals through magnetic coupling rather than electrical direct connection, fundamentally cutting off this circuit and eliminating humming sounds to obtain pure audio signals.

Common mode noise suppression: It can effectively suppress interference noise (common mode noise) that occurs simultaneously on signal and ground lines, such as interference from power lines and RF equipment.

2. Signal transmission and impedance matching

600 Ω: 600 Ω Impedance Matching: Its input and output impedances are designed to be 600 ohms, which matches the standard impedance of many professional audio devices such as old-fashioned mixing consoles, telephone equipment, and dynamic microphones. It can ensure efficient transmission of signal energy at a specific impedance, reducing distortion and frequency loss caused by signal reflection.

3. High quality audio performance (achieved by Permalloy)

Excellent frequency response: Pomo alloy has extremely high magnetic permeability, which makes the transformer have excellent response, especially at low frequencies, with deep diving and low distortion.

High fidelity: The low magnetic core loss and low distortion characteristics ensure that the audio signal can preserve the original details and dynamic range to the maximum extent after transformation, making it suitable for high fidelity audio applications.

4. Additional functions brought by physical structure (implemented by "EI28", "Soft feed", "2+2")

Anti micro sound effect: "Soft feet" can absorb mechanical vibrations and prevent them from being transmitted to the transformer core through the circuit board, thereby suppressing the "micro sound effect" (the phenomenon where transformers convert physical vibrations into electrical noise), which is particularly important for high gain preamplifiers.

Easy to install and solder: The layout of the "2+2" pins (2 primary and 2 secondary pins each) is clear, making it easy to lay out and solder on a printed circuit board (PCB).

Standard size: "EI28" is a standard size specification that facilitates the opening and fixing of the chassis, ensuring the universality of the equipment.

In summary, the functions of this transformer can be summarized as follows:
In professional audio systems, through magneto electric isolation technology, audio signals are transmitted without distortion between devices that perfectly match a 600 ohm impedance, while completely eliminating noise caused by grounding circuits and electromagnetic interference. Its physical design also ensures stability against vibration interference. It is often used in microphone preamplifiers, analog input/output of digital audio interfaces, record head amplifiers, and other situations that require high sound quality and clean backgrounds.

2.Performance Characteristics

3.Other Recommended Produtcs

4.Company Profile