ZXY1527 Audio Isolation Transformer - Permalloy Core, 1+1:1+1, 8-Pin, 20 Hz-50 kHz ±0.5 dB, THD < 0.01%, CMRR > 90 dB, 1500 Vrms Isolation

1. Product Name

ZXY1527 audio isolation transformer. Permalloy shielded, 1+1:1+1 winding configuration, 8-pin layout, frequency response within ±0.5 dB from 20 Hz to 50 kHz, total harmonic distortion below 0.01%, and isolation voltage of at least 1500 Vrms.

Overview. The ZXY1527 is a passive shielded audio isolation transformer featuring a high-permeability permalloy (nickel-iron alloy) core. Its winding configuration is 1+1:1+1, utilizing an 8-pin terminal layout, and it is available in multiple standard impedance ratios, including 600 ohm : 600 ohm and 10k ohm : 10k ohm, offering flexibility for system integration.

The 1+1:1+1 designation describes the winding structure rather than a single turns ratio. The transformer contains two primary windings and two secondary windings with equal turns, each pair independently terminated to its own pins. This allows the same transformer to be wired directly as 1:1 with one primary and one secondary, or with windings paralleled for lower impedance and higher drive capability, or connected in series as required by the circuit. The 8-pin layout enables this selection at the board level without specifying it at the time of ordering.

2. Features

High-permeability permalloy (nickel-iron alloy) core. Minimal hysteresis loss maintains low distortion at low signal levels.

20 Hz - 50 kHz frequency response within ±0.5 dB. The response extends well beyond the audible band, ensuring stable phase and amplitude at the high end of the audio range.

Total harmonic distortion below 0.01% at rated level. Distortion is below the resolution limit of most measurement systems, not merely low.

Common-mode rejection ratio above 90 dB. Interference induced on both signal lines is effectively suppressed, not just attenuated.

Isolation voltage of at least 1500 Vrms. Isolation between primary and secondary for signal separation and safety protection in critical installations.

Insertion loss typically below 0.3 dB at 1 kHz. The transformer introduces virtually no level loss and can be used directly in the signal chain without a compensating gain stage.

Multiple standard impedance ratios. Both 600 ohm : 600 ohm and 10k ohm : 10k ohm are available on the same 1+1:1+1 platform.

1+1:1+1 winding structure with 8-pin layout. Two primary and two secondary windings are independently terminated, allowing series or parallel connection as required by the circuit.

Shielded construction. The metal housing and internal shield suppress EMI/RFI interference reaching the windings.

-40 °C to +85 °C operating temperature range. Suitable for equipment in non-temperature-controlled environments, covering the industrial temperature range.

Industrial-grade manufacturing process. Performance remains stable and repeatable over time, not a laboratory-grade device.

3. Advantages

Broadband flat frequency response. Covering the entire audio range and beyond, this device does not limit the bandwidth of the system in which it is installed.

Excellent linearity. High initial permeability and low coercivity ensure the magnetic response remains linear across the entire operating range.

Electrical isolation. Breaks ground loops, eliminating hum and buzz between equipment at different ground potentials.

Extremely low signal attenuation. Insertion loss below 0.3 dB at 1 kHz effectively preserves signal level without losing gain to the transformer.

High isolation voltage. Isolation capability of 1500 Vrms and above between windings, providing both signal separation and safety margin.

Consistent performance in demanding environments. Performance remains stable under professional and industrial conditions, without drift over temperature or time.

In the signal chain, the transformer is the only component that can separate two ground references without adding stages. With insertion loss kept below 0.3 dB and frequency response flat beyond 20 kHz, inserting the transformer does not alter the level or tonal character of the system: the input signal appears at the output at the same amplitude, and ground loops are blocked on the other side of the barrier.

4. Applications

Audio mixing consoles. Impedance matching and isolation for balanced signal paths in mixing consoles.

Broadcast and transmission. Provides clean, isolated audio signals for broadcast and transmission equipment.

Recording studio equipment. Low-distortion isolation for microphones, preamplifiers, and studio signal chains.

High-end Hi-Fi systems. Eliminates ground loop hum while preserving detail in high-end audio systems.

Mixing consoles, broadcast links, studio racks, and Hi-Fi systems all share the same failure mode: two devices connected to different ground references, linked by cable shields, produce hum at mains frequency. Inserting a transformer at the connection point eliminates the ground loop. In a mixing console, it also serves as an impedance interface between a 600-ohm line and a higher-impedance input, or as a 1:1 isolation element when levels are already matched.

5. Application Specifications

5.1 Performance Characteristics

6. Quality and Testing Assurance

Each ZXY1527 unit is manufactured under strict quality standards and individually verified before shipment. Isolation and withstand voltage testing is performed 100% on all units, not on a sampling basis, with full parameter verification completed prior to shipping.

In terms of compliance, the product is CE marked for electrical safety, RoHS compliant and lead-free, manufactured under an ISO 9001 certified quality management system, and uses UL recognized components. The product is rated industrial grade, suitable for professional and demanding applications rather than consumer-only equipment.