ZXY2207 Permalloy Audio Isolation Transformer, 600:600 / 600:600 Dual Winding / 10K:10K / 600:10K / 10K:600, Ground Loop Noise Isolator, 6-Pin PCB Mount

1. Product Name

The ZXY2207 Permalloy audio isolation transformer is a ground loop noise isolator for DI boxes, tube preamps, and line-level audio. It is available in five configurations: 600:600, 600:600 dual winding, 10K:10K, 600:10K, and 10K:600. Shielded metal case, six PCB pins with 4.0 mm pitch, package dimensions 22.0 x 18.3 mm.

Case. The markings on the surface indicate the turns ratio, model number, and polarity dots, so assembled boards can be inspected without referring to drawings. The case itself serves as the shield: it encloses the core and windings, and the tabs at the bottom are the mounting points for the device.

The reason for using a metal case rather than a bare bobbin lies in the application: these devices are installed between equipment with separate grounds, operating at levels where a few millivolts of induced hum is audible. The shield winding and the closed magnetic circuit are two tasks performed by the same piece of metal.

2. Features

High-permeability Permalloy core. The core is selected for permeability rather than size, which is why the high-ratio configurations achieve high inductance.

Noise cancellation and ground loop isolation. No conductor is shared between the two windings, so ground potential differences between two devices cannot form a path through this component.

Ultra-wide flat frequency response. A coupling coefficient close to 1 keeps the frequency response flat across the entire band; the low-frequency end is determined by primary inductance, and the high-frequency end by leakage inductance.

Fully enclosed Permalloy metal shield case. The case completely encloses the core and windings, so external magnetic fields are attenuated before reaching the windings rather than interfering directly.

High isolation voltage rating. Between primary and secondary: 1250 V AC for 60 seconds with a 1 mA leakage current limit.

Compact PCB pin-mount design. Six pins with 4.0 mm pitch, package dimensions 22.0 x 18.3 mm, mounted and soldered together with the rest of the circuit board.

The two annotations each correspond to one aspect of the product's promise. On one side is the Permalloy shield layer on the windings—used to prevent external magnetic fields from reaching the coil. On the other side is the compliance status declared in the datasheet: CE, RoHS, FCC, and ISO 9001. The original documentation does not provide certificate numbers; if your files require them, please request them from the manufacturer.

3. Advantages

100% factory-direct customization. Windings are customized to the customer's required turns ratio and impedance rather than selected from a catalog, which is why one case can offer five configurations.

Low total harmonic distortion. THD+N is below 0.005%, a specification that determines whether the transformer can be placed in the signal path without introducing audible coloration.

High consistency between batches. Turns ratio accuracy is ±2%, and DC resistance accuracy is ±15%, so replacement parts perform identically to the originals.

Declared global market compliance. The device declares compliance with RoHS, CE, FCC, and ISO 9001 standards; certificate documents should be requested separately for archival purposes.

Wide temperature range and harsh environment adaptability. Operating temperature −40 °C to +85 °C, storage temperature −45 °C to +125 °C, relative humidity 5% to 95%.

The rear of the case and the pin face are the basis for drawing the package dimensions: six pins in two rows of three, 4.0 mm grid pitch, mounting tab on one side, no adjustment required. Since the pin rows are symmetrical, the device's orientation on the board is determined by the polarity dot rather than the pin arrangement—if installed backwards, the output will be inverted.

4. Applications

Professional DI boxes and audio isolators. Stage instrument pickup, electric guitar and bass impedance matching, and balanced/unbalanced conversion in long cable runs.

Tube preamps and Hi-Fi systems. Input or output coupling in preamps, and transformers that handle balanced conversion and tone shaping in tube circuits.

AV multimedia installations and commercial displays. Isolating connections between computers or players and projectors, LED screens, or stage sound systems, where the two ends are powered by different supplies.

Broadcast and recording studio consoles. Eliminating hum that appears when consoles, workstations, matrix processors, and PA systems are at different ground potentials.

Automotive audio and DSP signal processors. Keeping ignition noise and alternator whine out of the signal path—both of which are introduced as ground potential differences rather than audio signals.

The AV wiring diagram is the most common application for this device: the player uses one power supply, while the projector, LED display, and sound system each use separate supplies. The workbench view is another aspect of verification—every unit undergoes a full-band sweep and distortion measurement before packaging.

5. Application Specifications

The following specifications are the nominal data for this device: general data, electrical parameter tables for each configuration, outline drawings, pin assignments, and taps.

5.1 Product Specifications

5.2 Electrical Specifications, Five Configurations, 25 °C

Inductance is measured at 100 Hz, 0.3 V signal across pins 1-3 and 4-6 as a minimum value; DC resistance tolerance is ±15% at 25 °C; turns ratio tolerance is ±2%; dielectric withstanding voltage is 1250 V AC with a 1 mA leakage current limit for 60 s.

5.3 Outline Dimensions