Are samples available and how are they charged?

Samples are available for serious customers. A sample fee is usually required but can be refunded or deducted after a bulk order. Lead time is 3-5 days.

What causes transformer failure and is there a warranty?

Failures are often due to overload, short circuits, or harsh environments. We provide a 1-year warranty covering free repair or replacement for quality issues.

12 0 12 5A Ei 48 24 0 24 Low Frequency Step Down Electric Audio Transformer with Shield Case

Name: 12 0 12 5A Ei 48 24 0 24 Low Frequency Step Down Electric Audio Transformer with Shield Case
Brand: Hangzhou Udwells Technology Co., Ltd.
SKU: 2238057585

Zhejiang, ChinaHangzhou Udwells Technology Co., Ltd.

US$0.50-1.50

500 Pieces

Product profile

Customization

Available

Application

Power, Electronic, Instrument, Lighting, Rectifier, Audio

Phase

Single

Model NO.

Core

Core-type Transformer

Cooling Method

Dry-type Transformer

Winding Type

Multi-winding Transformer

Certification

ISO9001

Usage

Single-phase Transformer

Frequency Characteristics

Low Frequency

Shape of Core

Operating Temperature

-40ºCTO +125ºC

Storage Temperature

-25ºCTO+85ºC

Customize

Yes

Type

Ei/Toroidal

Installation Method

Vertical/Horizontal/with a Base/with a Cover

Transport Package

Export Standard Carton and Strong Pallet

Specification

EI Series Low Frequency Transformer

Origin

Zhejiang

Production Capacity

200000 PCS/Month

Key features

Wide Power Range: Available from 0.3VA to 2000VA to meet diverse application needs.

EI Core Design: Core-type EI structure ensures stable performance for low frequency applications.

Shielded Construction: Equipped with shielding layers to effectively suppress electromagnetic interference.

Customization Options: Supports full customization including voltage, power, and installation methods.

High Quality Materials: Uses new high-grade silicon steel sheets and 100% pure copper wire.

ISO9001 Certified: Manufacturing process adheres to international quality management standards.

Comprehensive Testing: 100% inspection including Hi-Pot, inter-winding, and load tests before shipment.

Flexible Installation: Supports vertical, horizontal, base-mounted, or cover-mounted installation.

Company profile

High Repeat Buyers ChoiceFast DeliveryPrivate MoldQuality Assurance

Hangzhou Udwells Technology Co., Ltd.

Zhejiang, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 3 Years CertifiedNearest Port: Shanghai Port, Ningbo PortAverage Response Time: ≤4.34h

AI-Powered supplier vetting

SummaryHANGZHOU UDWELLS TECHNOLOGY CO. Ltd. was founded in 2008 and reports a self-built plant exceeding 15,000 square meters, more than 10 production lines, Europe as a primary export market, and peak-season order fulfillment within 15 working days. It provides multiple customization options, ODM services, and has launched new products within the past year. The supplier also reports OEM service for well-known brands and quality assurance in its quality-control processes. However, no R&D audit documentation, SDK, approved-supplier list, written service procedures, corrective/preventive-action procedures, or complaint-handling procedures were available. Overseas warehouses, showrooms, agents or branches, and offline trade-show participation were not reported. Financial information is insufficient for a credibility judgment, and sustainability-related fire-drill and environmental-assessment status is unknown.

After-Sales capabilityTechnology engineers are responsible for technical support during production and after-sales service, but the supplier has no written procedures or records for effective service assessment, corrective and preventive actions, or customer complaint handling. It also has no overseas warehouse, showroom, agent, or branch, limiting evidence of structured or localized after-sales support.

R&D capabilityThe supplier reports new products within the past year, ODM capability, customization-related R&D services, and use of PS and CAD. It also reports OEM service for well-known brands. Countervailing evidence includes only one year of total R&D engineer experience, no available SDK, and no R&D design-input, output, review, verification, or validation documents for audit.

Production capacityThe supplier reports a self-built plant exceeding 15,000 square meters, more than 10 production lines, complete testing facilities, and peak-season order fulfillment within 15 working days. These explicit operating-scale and delivery statements support a production-capability advantage, although the number of quality-control staff is listed as unavailable.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, flexible customization, and minor customization. It also provides ODM services, demonstrating broad stated customization coverage.

Client casesThe supplier states that it provides OEM services for well-known brands and identifies Europe as a primary export market. These statements indicate some brand and export experience, but no customer names, project details, order references, or verifiable case documentation are provided.

Product Q&A

Q:Which should I choose: Toroidal or EI transformer?

Toroidal offers high efficiency and low interference but is larger and more expensive. EI is smaller, lighter, cheaper, and easier to maintain, suitable for general industrial use.

Q:What is the function of the shielding layer?

The shielding layer (copper foil) between primary and secondary coils is grounded to suppress high-frequency interference, enhancing EMI resistance for audio and measuring instruments.

Q:How do you ensure quality and service life?

We use high-grade silicon steel and pure copper, apply vacuum impregnation (VPI) for moisture resistance, and conduct 100% factory tests including Hi-Pot and load tests.

Q:What is the price and minimum order quantity (MOQ)?

Price depends on power and customization. MOQ is typically 100pcs for standard specs and 500-1000pcs for custom specs requiring mold opening.

Q:How long does delivery take?

Standard products take 10-15 working days. New customizations require an additional 5-7 days for samples. Large orders may take 15-30 days.