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  • Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized
  • Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized
  • Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized
  • Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized
  • Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized
  • Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized
Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized
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Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized

  • 1 - 499 Pieces
    $12
  • >= 500 Pieces
    $8
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Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • High-Power Energy Transfer: Designed to deliver 400W power for amplifiers and industrial equipment, ensuring stable energy conversion with minimal energy loss.
  • Customizable Multi-Voltage Configuration: Supports input voltages (110V–3kV) and output voltages (12V–480V), adaptable to diverse power requirements via customizable coil configurations.
  • Toroidal Design Efficiency: The doughnut-shaped core minimizes magnetic leakage and noise, offering high efficiency (up to 95%) and low electromagnetic interference.

Key features

  • 1. Material Technology

    • With a copper winding and insulated ribbed casing, you can achieve superior heat dissipation and durability in demanding environments.

  • 2. Interactive Design

    • With customizable coil configurations, you can tailor the transformer to specific power requirements (e.g., audio amplifiers or industrial systems).

  • 3. Performance Parameters

    • With high efficiency and low noise operation, you can minimize energy waste and acoustic disturbance in sensitive settings.

  • 4. Scenario Solutions

    • With multi-voltage compatibility (12V–480V), you can seamlessly integrate the transformer into diverse systems, from home audio setups to commercial power supplies.

  • 5. Certification Standards

    • With industry-standard materials and construction, you can ensure compliance with safety and performance benchmarks for power applications.

Product details

Holmgren Toroidal Power Transformer 400w Toroidal Transformer for Power Amplifier Customized

The Holmgren Toroidal Power Transformer 400W is a high-efficiency, low-noise power solution designed for power amplifiers and industrial applications. Its toroidal core wrapped in a transparent, ribbed insulating material ensures compactness, thermal stability, and environmental protection. Customizable coil configurations and a wide range of input/output voltage options make it adaptable to diverse power distribution needs.

Technical specifications

FeatureSpecificationBenefit
Core MaterialFerrite/iron core with copper windingsHigh magnetic permeability and low energy loss.
Coil StructureToroidal designMinimizes magnetic flux leakage for 95%+ efficiency.
Input Voltage110V, 220V, 240V, 380V, 3kVSupports global power standards for versatile deployment.
Output Voltage12V, 24V, 110V, 220V, 360V, 380V, 440V, 480VCustomizable to match amplifier or equipment requirements.
Insulation MaterialTransparent ribbed polymerResists moisture, dust, and UV exposure while enabling visual monitoring.
PhaseSingle-phaseSimplifies integration into standard power systems.
Noise Level<30dB (measured at 1m)Ideal for noise-sensitive environments like home theaters or offices.

Customization guide

  • Adjustable coil count to meet specific power output needs (e.g., 8–12 coils for multi-output configurations).
  • Material customization: Reinforced ribbed insulation for high-temperature (up to 120°C) or corrosive environments.
  • Voltage adaptation: Input/output ratios can be tailored to match regional power grids or equipment specifications.

Get inspired

With its compact toroidal design and customizable voltage options, this transformer is perfect for powering high-fidelity audio systems, industrial control panels, or renewable energy inverters. The transparent casing allows real-time monitoring of core health, while the low-noise operation ensures seamless integration into sensitive environments.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Efficiency92%+95%+98% (30% better than industry standard)
Noise Level30dB28dB (-6.7%)25dB (-16.7%)
Max Power Capacity350W400W500W
Customization ScopeStandard voltages±10% voltage tuningFull coil/wattage customization

Supplier's note

  1. Technical Breakthroughs:

    • Copper Windings: With copper, you can achieve 20% lower resistance than aluminum, ensuring minimal energy loss.
    • Toroidal Geometry: The doughnut shape reduces stray magnetic fields by 40% compared to E-I core transformers.
    • Ribbed Insulation: The transparent material allows heat dissipation while resisting humidity (IP54-rated), outperforming standard epoxy coatings.

  2. Version Selection Guide:

    • Base Model: Ideal for home amplifiers or low-power industrial systems requiring standard voltages (e.g., 220V to 12V).
    • Advanced Model: Suitable for commercial audio setups or solar inverters needing ±10% voltage flexibility.
    • Pro Model: Engineers handling high-power applications (e.g., industrial motors or medical devices) benefit from its 500W capacity and full customization. For instance, the Pro’s tripled chemical resistance (vs. industry norms) ensures longevity in harsh factory environments. Pair this with its 98% efficiency to reduce cooling costs by 25%.

Frequently asked questions

  • Which toroidal transformer suits power amplifiers with high efficiency needs?

  • How to maintain the transparent ribbed insulation on a toroidal transformer?

  • Copper vs. Aluminum windings: Why is copper better for this transformer?

  • Can I customize the coil numbers and voltage for my project?

  • Is this transformer certified for industrial power applications?

  • What makes this toroidal transformer suitable for noise-sensitive environments?

  • Which voltage configurations work with the Holmgren 400W transformer?

  • Can this transformer handle multiple electrical connections?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Toroidal Transformer (Industry Standard)Power amplifiers, audio equipmentNoise: 40 dBA (similar to a quiet room)
Efficiency: 95% (IEC 60076-7)
Weight: 5kg (ISO 2281)		High efficiency, low noise, compact designHigher cost, complex installation
Holmgren Base ToroidalHome audio systems, small amplifiersNoise: 35 dBA (quieter than a refrigerator)
Efficiency: 96% ▲
Weight: 4.5kg ▲
Copper winding		Cost-effective, compact, reliable for basic power needsLimited voltage customization (fixed 110V/220V input)
Single-phase only
Holmgren Advanced ToroidalIndustrial power supplies, high-end audioNoise: 30 dBA ▲ (quieter than a whisper)
Efficiency: 98% ▲
Weight: 4kg ▲
Customizable voltages (up to 3kV)
Multi-coil design (up to 8 coils)		Ultra-quiet, customizable voltage ranges, high power handling (400W)Higher price, requires专业 installation for complex setups
E-I Core Transformer (Industry Standard)General power distribution, lightingNoise: 50 dBA (louder than a conversation)
Efficiency: 90%
Weight: 8kg		Lower cost, easier to repair, widely availableBulky, higher noise, less efficient than toroidal
Shell Core Transformer (Industry Standard)High-frequency applications (e.g., welding)Noise: 45 dBA
Efficiency: 92%
Weight: 6.5kg		Compact for high-frequency use, durableLess efficient than toroidal, limited scalability
Autotransformer (Industry Standard)Voltage adjustment in factoriesEfficiency: 97%
Adjustable voltage (IEC 60076-8)
Weight: 7kg		Adjustable voltage output for variable loadsNo isolation between windings (safety risk)
Not suitable for sensitive electronics

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