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    Picture of 30V 3A Linear Adjustable DC Power Supply, 90W
    Picture of 30V 3A Linear Adjustable DC Power Supply, 90W
    Picture of 30V 3A Linear Adjustable DC Power Supply, 90W

    30V 3A Linear Adjustable DC Power Supply, 90W

    1 review(s) | Add your review
    SKU: PH-DCPS-303
    $181.79
    ● 0–30V voltage and 0–3A current are continuously adjustable, with a rated power of 90W. ● Humanized compact design, digital display with fine-tuning and coarse-tuning knobs. ● Built-in multiple protections, ensuring efficient operation and safety. ● Suitable for working environments of 0–40℃/85% RH, with strong stability.
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    ⏱️ Delivery: 6-12 days
    🔙 30-day Returns
    Overview

    Cost-effective linear adjustable DC power supply features a high-performance transformer for stable AC-to-DC conversion, supports 110V/220V±10% wide voltage input for global use, comes with a 3-digit LED display for clear real-time readings; it supports both digital and analog control via external systems, delivering stable, precise, and reliable power output ideal for electronics testing, laboratory research, production lines, and equipment maintenance, combining superior performance, durable construction, and budget-friendly pricing to be your all-purpose professional DC power solution.

    Linear Adjustable DC Power Supply Features

    Feature

    • Multiple Protections: Built-in overcurrent and overvoltage protection effectively safeguard the equipment and loads, ensuring peace of mind even during long-term operation.
    • Compact and Cost-effective: The body is small and lightweight, convenient for table placement or integration.
    • Precise Regulation: Voltage and current are continuously adjustable, providing a pure and reliable power supply environment for sensitive electronic components.
     

    Details

    1. Clear Indicator Lights: Equipped with three-color indicators for POWER, CV, and CC, making it easy to quickly determine the device's operating mode.
    2. High-precision Digital Display: A 3-digit LED display shows real-time output voltage readings, making the power supply parameters clear at a glance.
    3. Dual Knobs for Precise Adjustment: Equipped with dual knobs, enabling quick rough adjustment and precise fine adjustment of voltage and current to meet diverse operational needs.
    30V 3A Linear Adjustable DC Power Supply Detail

    30V 3A Linear DC Power Supply Structure

    30V 3A Linear Adjustable DC Power Supply Structure

    Specs
    Model PH-JK1303P
    Input Voltage 110V or 220V AC (+/- 10%)
    Output Voltage Range DC 0-30V
    Output Current Range 0-3A
    Output Power 90W
    Frequency 50Hz/60Hz
    Output Type Dual
    Display 3 digit
    Display Accuracy ≤ ±0.1%＋2d
    Voltage Display Resolution 10mV
    Current Display Resolution 10mA
    Efficiency >65%
    Voltage Regulation
    Load Regulation (CV) 1×10-4+8mV
    Line Regulation (CV) 1×10-4+3mV
    Ripple & Noise (P-P) 0.5mV
    Temperature Coefficient 300PPｍ/℃
    Current Regulation
    Load Regulation (CC) ≤5mA
    Line Regulation (CC) 2×10-4+3mA
    Temperature Coefficient 500PPｍ/℃
    Others
    Recovery Time ≤100µs
    Operating Ambient 0℃ to + 40℃/ 85%RH
    Storage Ambient -10℃ to + 80℃/ 80%RH
    Warranty 12 Months
    Size 290 (L) x 130 (W) x 165 (H) mm
    Weight 4kg
    Application
    Electrochemical Experiment

    Electrochemical Experiment

    Automotive Motor

    Automotive Motor

    Electronic Component Testing

    Electronic Component Testing

    Display Screen and Electronic Device

    Display Screen and Electronic Device

    FAQ

    Q1: What are the main application scenarios of linear adjustable DC power supplies?

    This linear adjustable DC power supply can be widely used in electronic research and development, laboratory debugging, electronic equipment maintenance and testing, teaching and training, product testing in small production lines, as well as DIY projects of electronic enthusiasts, providing stable and precise DC power supply support for various electronic circuits.

    Q2: What is the significance of the ripple voltage in linear DC power supply?

    Ripple voltage is a key indicator of output quality, representing the AC component overlaid on the DC output. Excessive ripple can cause unwanted voltage fluctuations that may impair the performance or even damage sensitive electronic circuits, especially in precision instruments, audio equipment, and other high-stability applications. Minimizing ripple is essential to ensure a stable, clean power supply, which directly boosts the efficiency and accuracy of the system. Engineers and designers achieve low ripple through optimized circuit design, filtering, and regulation to meet the strict demands of modern electronic systems.

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    1 review(s)
    5.0 1
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    Finnian | 9/15/2026 1:47 AM
    Great 30V 3A Linear DC Power Supply
    This 30V 3A linear power supply works great in my electronics lab. The 0–30V and 0–3A adjustment is smooth, with coarse and fine controls for easy tuning. The dual LED display is clear, and the overcurrent and overvoltage protection are useful. Stable output and a solid build overall.
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