ZXY-EI16 is a microphone transformer in fly-lead form: an EI16 laminated steel core, a coil wound on an insulated bobbin under a yellow tape wrap, and four colour-coded leads instead of PCB pins. Two turns-ratio versions are standard, 1:5 as type B2456 and 1:6 as type B2577, both specified over 50 Hz to 20 kHz and both rated 1500 V at 1 mA / 60 s. Overall 16.5 mm long, 14.5 mm high and 14.5 mm deep. Electrical data at 25 °C. The leads identify the windings at the bench: BLUE and YELLOW on the primary, which is the microphone side, RED and GREEN on the secondary, which is the console side, with the phase end of each winding marked by a dot on the wiring diagram. Because there are no pins the part is wired into a microphone body, a harness or an existing board assembly after the mechanical design is fixed.

ZXY-DU135 is a microphone transformer in flying-lead form: a laminated silicon steel core, a copper winding on a nylon bobbin under an insulation wrap, and four colour-coded leads (BLACK, RED, BLUE, YELLOW) instead of PCB pins. Three turns-ratio versions run in the same body, 1:1.2, 1:2 and 1:5, all specified over 50 Hz to 20 kHz and all rated 1500 V at 1 mA / 60 s. Overall 19.5 mm long, 16.5 mm high and 13.0 mm across, with the core stack 7.0 mm thick. Electrical data at 25 °C. Leads rather than pins means the part is wired into a harness, a microphone body or an existing board assembly after the mechanical design is settled. The isolation breaks the conductive path between two audio circuits while passing the signal, which removes the AC mains interference and the ground-loop hum that appear when equipment is earthed at different points, and it cuts the external interference picked up on both balanced and unbalanced runs.

ZXY DU124 is a microphone transformer in fly-lead form: stacked EI lamination core, precision copper winding under high-dielectric-strength yellow Mylar tape, and four pre-tinned leads with UL AWM style insulation instead of PCB pins. Turns ratio 1:4, 1:7 or 1:12, frequency range 20 Hz to 20 kHz, dielectric withstand 1500 V at 1 mA / 60 s. Body 16.5 mm wide, 12.0 mm deep, 25.0 mm high, leads 40 ± 2 mm. Electrical data at 25 °C. Four leads and no pins means the part is wired rather than placed on a footprint, which is what makes it usable inside a microphone body, on a flying harness, or in a retrofit where the mounting position is already fixed. The isolation breaks the ground connection between two stages while passing the signal, removing the AC hum that appears when equipment sits on different earth potentials, and it reduces interference on both balanced and unbalanced runs.

ZXY EE25-1:1A is an EE25 series audio transformer with a 1:1 turns ratio, built on a high-frequency ferrite core held in a metal frame. Primary winding on pins 1 to 4, secondary on pins 5 to 8. Vertical through-hole PCB mount on a 5.0 mm pin pitch, body 25.5 x 18.5 x 22.0 mm. The bobbin is PA66 with moulded pin terminal blocks, the winding is precision-wound copper with a tape wrap between winding and core, and the terminals are solder-plated. The model is laser-etched on the tape as ZXY EE25-1:1A. Production is covered by an ISO 9001:2015 quality management system, certificate 38124Q0614R0S, and the model family is covered by a CE Certificate of Conformity under the Low Voltage Directive 2014/35/EU, certificate CKX2519109071.

ZXY-EI19 is an EI19 hard-pin audio isolation and voice / data coupling transformer in a DIP through-hole package, 19.5 x 15 x 17 mm with a 5 mm pin pitch. Four catalogue models share the footprint: EI1901 and EI1902 at 1:1, EI1904 at 1:5 and EI1905 at 1:11. Inductance, measured at 1 kHz with a 0.3 V signal and quoted as a minimum, runs from 585 mH on both windings of the EI1902 to 1.2 H on both windings of the EI1901 and 17 H on the second winding of the EI1905. DC resistance is quoted to ±15 percent, from 12.5 ohm on the EI1904 second winding to 1.58 kohm on the EI1905 second winding. Frequency range 100 Hz to 4.5 kHz. Hi-POT 500 V at 1 mA leakage for 60 s on every model. Marked CCC, CE and UL.

ZXY-3529 is a permalloy audio isolation transformer in an 8-pin DIP through-hole package. Two turns-ratio variants are specified for the model: 1+1:1 with DCR 26 + 52 Ω max between pins 1-4 and 70 Ω max between pins 5-8, and 4:1 with 700 Ω and 45 Ω respectively, all at 25 °C. Maximum 50 Hz input level at 1% THD is +12 dBu (1+1:1) and +22 dBu (4:1). Overall frequency range 10 Hz to 40 kHz; response from 20 Hz to 20 kHz within ±0.16 dB (1+1:1) and ±0.10 dB (4:1), referred to +4 dBu at 1 kHz. Hi-POT 1250 V at 1 mA for 60 s. Permalloy case 35.0 × 29.0 × 26.0 mm, pin pitch 5.0 mm. Nameplate reads 150/600:10K. Marked CCC, CE, RoHS and UL.

ZXY EI10 is a compact single-phase audio transformer from the ZXY EI10 Series. It is built on an EI10 shell-type core held by a black core clamp, wound with copper wire and taped in yellow insulation, and seated on a molded green bobbin that carries the through-hole solder pins. A red dot on the bobbin face marks orientation, and production units carry the marking 24013G-T1B printed on the tape wrap. The lead way is pins, so the part mounts directly on a PCB by through-hole soldering, and the compact outline suits dense board layouts. Sold in cartons, marked CCC, CE, RoHS and UL. Origin Shenzhen, China; brand ZXY; model EI10.

ZXY1806 is a single-phase low-frequency audio transformer built on a toroidal copper coil in an autotransformer configuration. It mounts by DIP through-hole on a 2+3 pin layout: pins 1-2 are the input side and pins 3-5 the output side, kept on two separate rows of the body so primary and secondary connections stay distinct during assembly. The winding is encapsulated in high-grade epoxy resin potting and the faceplate carries a clear laser silkscreen showing the ZXY AUDIO brand, the impedance ratio and the model number, so a unit stays identifiable after potting and through its service life. Impedance ratios available are 600:600, 600:10K and 10K:10K; the electrical specification can be customized to the circuit. Supplied in cartons, marked CCC, CE, RoHS and UL.

ZXY1527 is a passive, shielded audio isolation transformer on a high-permeability Permalloy (Ni-Fe alloy) core, supplied in a 1+1:1+1 winding configuration with an 8-pin terminal layout. It covers 20 Hz - 50 kHz flat within +/-0.5 dB with total harmonic distortion below 0.01%, common-mode rejection above 90 dB and at least 1500 Vrms isolation between primary and secondary. Standard impedance ratios include 600 ohm : 600 ohm and 10k ohm : 10k ohm. Insertion loss is typically under 0.3 dB at 1 kHz, and the unit is rated from -40 C to +85 C.

ZXY-6731 is a passive, epoxy-encapsulated audio isolation transformer supplied in two impedance configurations: Model A at 150:600-40Vrms for impedance matching, and Model B at 600:600-40Vrms for 1:1 line isolation. Both are rated 40 Vrms with 4000 VAC dielectric strength primary to secondary, optimised for the 150 Hz to 600 Hz band, and built in a multi-fin industrial housing with convective cooling ribs. Terminals are a 20-pin dual-row solder-pin array - primary 1-5, secondary 1-10, auxiliary 1-5 - and the unit mounts on four corner chassis flanges. No external power is required.

EI2401-1:2 is a passive 1:2 step-up audio isolation transformer. The 1:2 turns ratio gives about +6 dB of voltage gain while the primary and secondary stay galvanically separate, so two pieces of audio equipment at different ground potentials can be connected without circulating ground current. No power supply, no battery, no active circuitry: audio passes from primary to secondary by magnetic coupling alone. Wound on an EI silicon steel lamination core with electrostatically shielded, high-purity copper windings and flame-retardant yellow Mylar tape, it covers 20 Hz - 20 kHz and mounts on a 3+3 through-hole DIP footprint.

ZXYAUDIO P3188 is a 1:1 audio isolation transformer in a 6-pin surface-mount package, built in a thermoplastic case with epoxy potting and an integrated metal shield plate. It breaks the galvanic ground link between two audio stages while coupling the signal by magnetic induction, which removes 50/60 Hz hum, buzz and common-mode interference without attenuating the signal. The 3 + 3 pin layout (primary 1-2, secondary 3-4, shield ground 5-6) is made for automated pick-and-place and reflow soldering. Turns ratio 1:1 +/-2%, operating range -40 C to +85 C, 100% tested, CE / RoHS / ISO9001:2015.