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

1. Product Name

ZXY2207 permalloy audio isolation transformer, ground loop noise isolator for DI boxes, tube preamps and line-level audio, in five builds: 600:600, 600:600 dual, 10K:10K, 600:10K and 10K:600. Shielded metal can, six PCB pins on a 4.0 mm grid, footprint 22.0 x 18.3 mm.

The can. The marking on the face carries the ratio, the model and the polarity dot, so a populated board can be checked without referring to a drawing. The can itself is the shield: it closes over the core and the winding, and the tab at the base is what the part sits on when it is seated.

The reason for a metal can rather than a bare bobbin is the application: these parts sit between equipment earthed separately, at levels where a few millivolts of induced hum is audible. Shielding the winding and closing the magnetic path are one piece of metal doing two jobs.

2. Feature

High-permeability permalloy core. The core is chosen for permeability rather than for size, which is where the inductance of the higher-ratio builds comes from.

Noise elimination and ground loop isolation. The two windings share no conductor, so a ground potential difference between two pieces of equipment has no path through the part.

Ultra-wide and flat frequency response. Coupling close to one keeps the response flat across the band; the low end is set by the primary inductance and the top by the leakage inductance.

Complete permalloy metal shielding enclosure. The can closes around the core and winding, so external fields reach the windings attenuated rather than directly.

High Hi-Pot isolation rating. 1250 V AC held at a 1 mA leakage limit for 60 s, between the primary and the secondary.

Compact PCB pin-mount design. Six pins on a 4.0 mm grid over a 22.0 x 18.3 mm footprint, placed and soldered with the rest of the board.

The two callouts are the two halves of the proposition. On one side, permalloy shielding over the winding - what stops external fields reaching the coil. On the other, the compliance status the specification declares: CE, RoHS, FCC and ISO 9001. The certificate numbers are not given in the source, so ask for them if your file needs them.

3. Advantage

100% factory-direct customisation. Windings are built to the customer's ratio and impedance rather than picked from a catalogue, which is why five builds are offered on one body.

Low total harmonic distortion. THD+N is stated below 0.005%, the figure that decides whether a transformer can sit in a signal path without colouring it audibly.

High consistency across batches. Ratio is held to ±2% and DC resistance to ±15%, so a replacement part behaves like the one it replaces.

Global market compliance declared. RoHS, CE, FCC and ISO 9001 are declared for the part; the certificates themselves should be requested if they are needed on file.

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

The back of the can and the pin face are what a footprint is drawn from: six pins in two rows of three on a 4.0 mm grid, the mounting tab on one side, and no adjustment anywhere. Because the pin rows are symmetric, the orientation of the part on the board is fixed by the polarity dot and not by the pin pattern - fit it the wrong way round and the output is inverted.

4. Application

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

Tube preamps and hi-fi systems. Input or output coupling for a preamplifier, and the transformer that does balanced conversion and tonal coloration in a valve circuit.

AV multimedia engineering and commercial display. Isolating a computer or a player from a projector, an LED wall or a stage sound system, where the two are fed from different supplies.

Broadcast and recording studio consoles. Removing the hum that appears when a console, a workstation, a matrix processor and the reinforcement system sit at different ground potentials.

Car audio and DSP signal processors. Keeping ignition noise and alternator whine out of the signal path, both of which arrive as a ground-borne difference rather than as audio.

The AV diagram is the case the part is bought for most often: a player on one supply feeding a projector, an LED display and a sound system on others. The bench view is the other half of the claim - every unit is swept across the band and its distortion measured before it is packed.

5. Application Specifications

The specification below is the data declared for this part: the general data, the electrical table per build, the outline as drawn, and the pin assignment with its taps.

5.1 Product specification

5.2 Electrical specification, five builds, 25 °C

Inductance is a minimum measured at 100 Hz with a 0.3 V signal across pins 1-3 and 4-6; DC resistance carries ±15% at 25 °C; the ratio carries ±2%; dielectric withstand is 1250 V AC at a 1 mA leakage limit for 60 s.

5.3 Outline dimensions

5.4 Pin assignment and winding polarity

6. Quality & Testing Assurance

Every unit is tested before packing, not sampled. The test items are the turns ratio and polarity, the inductance of both windings, the DC resistance of both, the 1250 V Hi-Pot between primary and secondary, and an audio band sweep with distortion measurement.

Packing is a custom foam grid inside a heavy-duty export carton, so the cans arrive with their pins straight. OEM and ODM work is available, with a sample lead time of 7-10 days.

Brand / manufacturer: ZXY, Shenzhen Zhixiangyuan Electronics Co., Ltd. http://www.zxycoil.com