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.

ZXY EI19-Permalloy is a precision-wound audio isolation transformer on a high-permeability permalloy (nickel-iron) core, supplied in a flame-retardant DIP 3+3 pin through-hole package measuring 19.5 x 17.5 x 17.0 mm. Three standard impedance configurations are available - 600:600 (1:1), 600:10K (1:4) and 10K:10K (1:1) - so a single footprint covers line-level and higher-impedance interfacing. The magnetic path transfers voice and data while the primary and secondary windings stay galvanically isolated: ground loops are interrupted, the AC hum caused by system grounding disappears and common-mode interference is rejected, without altering the audio content. Audio band 50 Hz - 20 kHz, dielectric strength 1250 V at 1 mA for 60 s, operating temperature -40 to +125 C, CE and RoHS compliant, produced in an ISO 9001 certified factory.

EI14 vertical audio isolation transformer, 600 Ω : 600 Ω, reference part number ZXY-B2127-2, hard-pin version. 1:1 turn ratio on terminals 1-3 : 4-6 within ±2%, parallel inductance 300 mH ±25% at 1 kHz / 0.25 V, DCR 82 Ω ±15% on the primary and 102 Ω ±15% on the secondary. Insertion loss ≤2 dB max at 1 kHz, frequency response 300 Hz - 3.5 kHz within ±2 dB. Dielectric strength 1000 VAC at 1 mA for 2 s between primary and secondary. Cold-rolled high-permeability silicon steel core, V-0 flame-retardant bobbin, 130 °C / 155 °C dual-insulation wire, vertical through-hole rigid pins. RoHS compliant.

ZXYDU19 is a permalloy audio isolation transformer in a sealed metal case with DIP through-hole pins. Turns ratio 1:1+1+1: one primary and three independent secondaries on a single high-permeability nickel-iron core. Frequency range 10 Hz to 100 kHz at ±0.5 dB; maximum 50 Hz input +6 dBu at 0.2% THD; primary DCR 32 Ω MAX and secondary DCR 63 + 67 + 72 Ω MAX at 25 °C; dielectric strength 1250 V at 1 mA for 60 s. The galvanic barrier blocks DC and ground potential differences between circuits and removes the AC hum caused by ground loops, while attenuating external interference in both balanced and unbalanced lines. Case 47.5 x 29.0 x 24.0 mm with 2.5 / 30.7 / 2.5 mm pin rows for direct PCB mounting.

EI66*28 encapsulated audio isolation transformer for audio amplifier and low-frequency isolation duty. Wound for a 220 V AC, 50 Hz primary with a 23 V ±5% no-load output on the blue-blue winding, 55 mA MAX no-load current and 4.5 W MAX no-load loss. H50N electrical steel EI66 laminated core, flame-retardant Nylon 101 bobbin, vacuum varnish impregnated and fully encapsulated, zinc-plated steel mounting bracket, 250 ±10 mm silicone lead wires with tinned copper terminations. AC 1500 V primary-secondary and AC 1000 V winding-to-core dielectric strength, insulation resistance ≥100 MΩ MIN. ZXY Part No. B2348, specification 20230803003.

The EI-4120W-5409 is a chassis-mount power transformer with a dual 110 V primary that can be wired for either 110 V or 220 V mains, and a centre-tapped secondary giving 12 V-0-12 V or 24 V at 250 mA. It is built on an EI-41 silicon steel lamination in a flame-retardant bobbin, sealed in a metal cover with two mounting flanges, and terminated in eight 6.3 x 0.8 mm solder tabs arranged 4 + 4.

The EE25-4.0H is a PCB-mountable audio isolation transformer built on the EE25 in-line bobbin platform. A 1:1:1:1 turns ratio and four matched 4.0 H windings give the part galvanic isolation between circuits, rejection of the AC hum created by system grounding, and clean coupling of balanced or unbalanced audio signals across the 20 Hz to 20 kHz range. It is used for voice and data coupling, for breaking ground loops between pieces of equipment, and for providing an isolated signal output.