Astron
Astron RS-4A
Best compact power supply for small-scale electronics and radio equipment.
Discover the Astron RS-4A, a reliable linear power supply designed for dependable performance. This unit is ideal for various applications, offering 4 Amps for Intermittent Commercial Service and 3 Amps for continuous operation. Its compact dimensions make it a practical choice for installations with limited space. As an open box item, this power supply presents a great opportunity to acquire dependable power at a value.
$72.29
Owner Satisfaction
4.7
/ 5
Category Rank
28
/ 1062
#28 in Computer Power Supplies
Price vs Category Average
-92%
Below average
Type
Linear Power Supply
/ Linear Power Supply
Who it's for
- Radio operators requiring clean, interference-free signal transmission
- Professionals needing equipment built for decades of reliable service
- Technicians demanding consistent power for sensitive electronic loads
Who should skip it
- Users with limited desk space or portable setup requirements
- Environmentally conscious buyers prioritizing low power consumption
- Budget-focused shoppers comparing price against modern switching alternatives
Performance breakdown
Voltage Stability
Linear architecture provides exceptionally clean power for sensitive electronic equipment.
Thermal Management
Compact design requires adequate airflow to maintain optimal operating temperatures.
Build Durability
Rugged metal chassis construction ensures long-term reliability in demanding environments.
Space Efficiency
Small footprint fits easily into tight racks or crowded workstations.
Current Capacity
Ideal for low-draw devices but limited for high-performance radio equipment.
Operational Noise
Silent linear operation eliminates the hum associated with switching power supplies.
Key Specs
Type
Linear Power Supply
Output Current (Continuous)
3A
Output Current (Intermittent Commercial Service)
4A
Dimensions
3-3/4 x 6-1/2 x 9 inches
Condition
OPEN BOX-USED
Model Number
RS-4A
Power Source
Wall Outlet
Maximum Power Output
4.0 Watts
Features
- Reliable linear power supply
- 4A intermittent service support
- 3A continuous current output
- Compact physical dimensions
- Open Box - Used condition
- Free Shipping included
What customers say
Customers overwhelmingly value the Astron RS-4A for its exceptional power stability and reliability. The linear design is the key feature, consistently delivering extremely low noise and ripple, which is crucial for sensitive communications gear. Users report rock solid voltage regulation even when the load changes. While the unit is large and heavy, this is accepted as a necessary trade off for its bulletproof construction and decades long longevity. Despite lacking modern amenities, the RS-4A is considered foundational bench equipment. Its superior performance stability and dependability firmly justify the investment, making it a benchmark product in its class.
Know before you buy
The 3A rating is the maximum current the unit can supply indefinitely without overheating. The 4A intermittent rating is for short-term use where the power demand peaks briefly, such as during radio transmissions.
Open box indicates that the item was previously handled or removed from its original packaging but remains in functional condition. It has been inspected to ensure it meets performance standards for a linear power supply.
Yes, as a linear power supply, the RS-4A provides a very stable, low-noise DC output. This makes it an excellent choice for sensitive communication equipment or audio gear that might be affected by the electrical noise often found in switching power supplies.
The unit measures 3-3/4 x 6-1/2 x 9 inches. You should also ensure there is at least an inch or two of clearance around the sides to allow for proper heat dissipation, as linear power supplies generate heat during operation.
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$72