{"product_id":"ei66-power-transformer-220v-to-9v-12v-15v-24v-3w-30w","title":"EI66 Power Transformer 220V to 9V 12V 15V 24V | 3W–30W","description":"\u003ch2\u003eEI66 Series EI Core Power Transformer – 220V AC Input, Multiple Output Voltages\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eEI66 Series Power Transformer\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Power Range:\u003c\/strong\u003e Available in 3W, 5W, 10W, and 30W ratings to suit light-load and moderate-load applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Output Options:\u003c\/strong\u003e Choose from single or dual (centre-tapped) outputs at 9V, 12V, 15V, or 24V AC.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e AC 220V \/ 50Hz — compatible with standard mains power in Europe, Asia, and other 220V regions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEI Core Construction:\u003c\/strong\u003e EI66\/57\/48\/41 laminated silicon-steel core for efficient, low-frequency operation and reduced electromagnetic interference.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle Phase:\u003c\/strong\u003e Compact single-phase autotransformer design ideal for space-constrained enclosures and PCB mounting.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomizable:\u003c\/strong\u003e Custom winding configurations available — ideal for OEM and bespoke electronic builds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo High-Concern Chemicals:\u003c\/strong\u003e Manufactured without restricted high-concern chemical substances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEI66 \/ EI57 \/ EI48 \/ EI41\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3W \/ 5W \/ 10W \/ 30W (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 220V \/ 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9V, 12V, 15V, or 24V AC — single or dual output\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePhase\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle Phase\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow Frequency\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoil Structure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEI Laminated Core (Autotransformer configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCustomization\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes — available upon request\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY audio amplifiers and preamplifier circuits\u003c\/li\u003e\n  \u003cli\u003eLinear power supply units (PSU)\u003c\/li\u003e\n  \u003cli\u003eElectronics hobby and prototyping projects\u003c\/li\u003e\n  \u003cli\u003eSmall household appliances and control boards\u003c\/li\u003e\n  \u003cli\u003eLED driver circuits and industrial control panels\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What output voltages are available for the EI66 power transformer?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this transformer compatible with 220V mains power?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I request a custom winding configuration?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between single and dual output on this transformer?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What output voltages are available for the EI66 power transformer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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. 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