EI66 Power Transformer 220V to 9V 12V 15V 24V | 3W–30W
EI66 Power Transformer 220V to 9V 12V 15V 24V | 3W–30W
EI66 Series EI Core Power Transformer – 220V AC Input, Multiple Output Voltages
The EI66 Series Power Transformer is a reliable, low-frequency EI core step-down transformer designed for electronics projects, DIY audio equipment, and general-purpose electrical applications. Available in multiple power ratings (3W, 5W, 10W, 30W) and a wide range of output voltages (9V, 12V, 15V, 24V — single or dual/centre-tapped), this transformer delivers stable, consistent AC output for a variety of circuit and device requirements.
Made in Mainland China.
Key Features
- Wide Power Range: Available in 3W, 5W, 10W, and 30W ratings to suit light-load and moderate-load applications.
- Versatile Output Options: Choose from single or dual (centre-tapped) outputs at 9V, 12V, 15V, or 24V AC.
- Input Voltage: AC 220V / 50Hz — compatible with standard mains power in Europe, Asia, and other 220V regions.
- EI Core Construction: EI66/57/48/41 laminated silicon-steel core for efficient, low-frequency operation and reduced electromagnetic interference.
- Single Phase: Compact single-phase autotransformer design ideal for space-constrained enclosures and PCB mounting.
- Customizable: Custom winding configurations available — ideal for OEM and bespoke electronic builds.
- No High-Concern Chemicals: Manufactured without restricted high-concern chemical substances.
Specifications
| Model | EI66 / EI57 / EI48 / EI41 |
| Rated Power | 3W / 5W / 10W / 30W (select variant) |
| Input Voltage | AC 220V / 50Hz |
| Output Voltage | 9V, 12V, 15V, or 24V AC — single or dual output |
| Phase | Single Phase |
| Frequency Type | Low Frequency |
| Coil Structure | EI Laminated Core (Autotransformer configuration) |
| Customization | Yes — available upon request |
| Origin | Mainland China |
Common Applications
- DIY audio amplifiers and preamplifier circuits
- Linear power supply units (PSU)
- Electronics hobby and prototyping projects
- Small household appliances and control boards
- LED driver circuits and industrial control panels
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Frequently Asked Questions
Q: What output voltages are available for the EI66 power transformer?
A: This EI66 series transformer is available in 9V, 12V, 15V, and 24V AC output options. You can select either a single output or a dual (centre-tapped) output depending on your circuit requirements. Please choose your preferred variant before purchasing.
Q: Is this transformer compatible with 220V mains power?
A: Yes. The transformer accepts AC 220V / 50Hz as the primary input, making it compatible with standard mains power supplies used in Europe, Asia, Australia, and other 220V regions. It is not intended for direct use on 110V mains without appropriate adaptation.
Q: Can I request a custom winding configuration?
A: Yes — this transformer supports custom configurations. If you require a specific output voltage, power rating, or winding arrangement not listed, custom orders are available. Please contact us with your specifications prior to ordering.
Q: What is the difference between single and dual output on this transformer?
A: A single output provides one AC voltage rail (e.g. 12V AC). A dual or centre-tapped output provides two symmetrical rails relative to a centre tap (e.g. +12V and −12V), which is commonly used in audio amplifier and op-amp power supply circuits.