Astron VS20M Power Supply

The Astron VS20M is a variable linear desktop power supply primarily used for ham radio, testing, and other electronic devices, offering a continuous output of 16 amps (20 amps peak) at 13.8 VDC (adjustable from 2-15 VDC).
Key Features and Specifications
The Astron VS20M is a heavy-duty, solid-state electronically regulated power supply known for its reliability and low noise.
Output Voltage: Adjustable from approximately 2 to 15 VDC via a front panel control.
Output Current:
Continuous: 16 amps at 13.8 VDC.
Intermittent/Peak: 20 amps.
Metering: Features separate lighted meters for continuous monitoring of both voltage and current.
Regulation: Solid state electronically regulated with a voltage regulation accuracy of 0.08% (from 0 to full continuous load).
Protection: Includes built-in safety features like fold-back current limiting and crowbar over-voltage protection to protect the unit from excessive current or shorted outputs.
Ripple: Produces very low ripple, less than 5 mV peak to peak (at full load and low line input voltage).
Cooling: Utilizes a heavy-duty heat sink for cooling, often without a fan, contributing to its quiet operation.
Input Voltage: Designed for standard 115 VAC input.
Physical:
Dimensions: Approximately 9 x 5 x 10.5 inches (W x H x D).
Weight: Around 20 lbs.
User and Expert Opinions
Reliability: Reviewers often praise its robust construction and claim that it “just keeps running” for years of reliable performance.
Performance: The linear design results in very low electrical noise (RFI), which is highly valued for sensitive applications like ham radio operation, as it avoids interference or a “hum” on transmissions.
Versatility: The adjustable voltage and current limiting features make it useful for general bench work and testing various devices.
Potential Cons: One reviewer noted that the meters are not illuminated, which could be a minor inconvenience in low-light conditions.