ZXYAUDIO EI19 Low-Frequency Audio Transformer - Single-Phase Toroidal Autotransformer, Copper Wire Winding, Through-Hole Pin PCB Mounting, Customizable Electrical Specifications

1. Product Overview

The EI19 is a single-phase low-frequency audio isolation transformer featuring a toroidal autotransformer structure. It is wound with copper wire and terminated with pins for use in electronic equipment. Since the electrical specifications for this model are custom-engineered, winding data is mutually agreed upon for each order, rather than drawn from a fixed catalog of standard values.

1T series high-frequency pulse and driver transformer, dual-color insulation, PCB mounting

Close-up of coil winding and 1T top marking

2. Key Features

• Single-phase transformer for low-frequency audio applications
• Toroidal coil structure with a compact, closed magnetic circuit
• Autotransformer configuration: input and output share a single winding, eliminating the need for a separate secondary winding
• Copper wire winding for stable electrical conductivity
• Pin termination for direct mounting and soldering
• Suitable for use in electronic equipment
• Electrical specifications customizable to customer requirements
• Carton packaging for convenient transport and storage

Key highlights and customization capabilities: custom turns ratio, inductance, and rated power, supporting OEM / ODM

Dual-color insulation structure: high-dielectric red coil wrap with yellow edge tape

3. Product Advantages

The toroidal winding method confines the magnetic flux within a continuous ring, rather than within stacked laminations. The magnetic path is short and closed, resulting in high magnetic efficiency and low leakage inductance, with minimal stray magnetic fields escaping to adjacent components. This is particularly important in electronic equipment, where transformers are often installed in close proximity to other components on the same assembly.

As the EI19 is an autotransformer, the input and output share a single winding rather than employing separate primary and secondary windings. This tapped-winding design requires fewer total turns and simplifies the coil structure, enabling a more compact and cost-effective component where the circuit allows a common winding. The product is suitable for low-frequency audio signals in electronic equipment.

The winding is constructed from copper wire, offering low resistance and stable conductivity. The leads are terminated as pins, allowing the transformer to be mounted and soldered directly onto the assembly. As the electrical specifications are customizable, the winding can be manufactured to the customer's specific requirements rather than to fixed standard values, and the finished product is packaged in a carton.

High-permeability ferrite core with low core loss at high frequencies

4. Application Areas

This transformer is defined as an audio transformer for use in electronic equipment, operating at low frequencies.

• Low-frequency audio circuits in electronic equipment
• Autotransformer signal transmission between common winding taps
• Compact toroidal transformer mounting positions within electronic assemblies
• OEM manufacturing requiring customized electrical specifications
• Equipment using pin-mounted transformers for direct board-level assembly

Industrial and power electronics applications: MOSFET / IGBT gate drive, SMPS and DC-DC converters, inverters, and EV chargers

Transformer mounted on a PCB assembly

5. Specifications

5.1 Specifications

Note: The line items above are transcribed from the specification sheet accompanying this model.

5.2 Model Summary

Top view, bottom view, side view, and isometric view of the pin-mount transformer

Close-up of pin leads and molded bobbin

6. Quality and Testing Assurance

• The quality of the EI19 is defined by the electrical specifications agreed upon for each order, which are confirmed prior to production and strictly implemented during the winding and assembly process.
• Constructed as a single-phase toroidal autotransformer with copper wire winding.
• Standard pin leads for direct mounting and soldering.
• Electrical specifications are customized per order, with each batch manufactured according to the agreed winding data.
• The product is packaged in a carton for convenient transport and storage.
• The model designation EI19 is marked on the accompanying specification sheet.

Quality assurance and testing standards: 100% withstand voltage test and turns ratio / inductance test

Products undergoing electrical testing on the workbench

Model: EI19  |  Type: Low-frequency audio transformer  |  Structure: Toroidal autotransformer, single-phase. Electrical specifications are customized per order: please send your winding data, quantity, and destination port to receive a quotation.