Victor 3303 / 3305 Dual-Channel Linear DC Power Supply | 2×30V/3A or 5A Output with Independent 2.5V/3.3V/5V Fixed Auxiliary Output

1. True Linear Architecture for Ultra-Low Noise and High Purity Output
At the heart of the VICTOR 3303 and 3305 lies a classic linear regulation design—not a switching converter. This fundamental choice delivers ripple and noise specifications as low as ≤1mVrms on the main adjustable channels (at I≤3A, 5Hz–1MHz) and ≤2mVrms for higher current draws. For engineers designing sensitive instrumentation, the absence of high-frequency switching artifacts is non-negotiable. This dual-channel linear DC power supply ensures that your measurements are not corrupted by conducted or radiated EMI, making it indispensable for audio distortion analysis, strain gauge excitation, phase-locked loop testing, and any application requiring a pristine DC source. The fixed 2.5V/3.3V/5V outputs similarly maintain ≤2mVrms ripple, ensuring that even digital supply rails remain clean enough to prevent logic errors or timing instability in FPGA and ARM-based systems.

2. Integrated Fixed-Output Section for Mixed-Signal Convenience
A hallmark of this linear DC power supply series is the dedicated fixed-output block that offers three selectable voltages—5V@3A, 3.3V@3A, and 2.5V@3A—from a single set of terminals. This eliminates the need for external step-down regulators or additional bench supplies when powering boards that require both analog rails (from the adjustable channels) and digital core voltages. Whether you are validating a sensor interface board, testing a wireless module, or developing a mixed-signal data acquisition system, this integrated solution reduces bench clutter, shortens setup time, and ensures that all supply rails share a common ground reference—critical for minimizing ground loops in precision measurements.

3. Series and Parallel Tracking for Expanded Application Range
The two adjustable channels are not merely independent; they offer tracking operation that transforms this dual-channel linear DC power supply into a highly flexible power source. In series tracking mode, the slave channel mirrors the master to produce up to 60V with tracking error ≤0.5%+10mV—ideal for high-voltage op-amp circuits, LED string testing, or simulating automotive battery stacks. In parallel tracking mode, the channels combine to deliver up to 6A (3303) or 10A (3305) with tracking current error ≤2%+50mA, perfect for powering motor drivers, heating elements, or high-current digital loads. The master-slave architecture simplifies operation: you adjust only the master channel, and the slave follows automatically—saving time and eliminating manual balancing.

4. Outstanding Line and Load Regulation for Critical Applications
As a premium linear regulated power supply, the VICTOR series excels in regulation performance. Line regulation (power supply effect) is specified at CV ≤0.01%+3mV and CC ≤0.2%+3mA, meaning that input voltage fluctuations from the AC mains have virtually no impact on the output. Load regulation is equally impressive: CV ≤0.01%+3mV (I≤3A) and ≤0.02%+5mV (I>3A), ensuring that output voltage remains stable even when the connected load suddenly changes—a common scenario when testing dynamic circuits like motor controllers or switching regulators. This level of precision makes the VICTOR 3303/3305 suitable for calibration labs, component characterization, and long-term aging studies where repeatability is paramount.

5. Simultaneous LED Display with High Readability
The front panel features dedicated LED displays for each adjustable channel, showing voltage and current values concurrently—no switching between channels or menus required. With display accuracy of ±(1% reading + 2 digits), you can confidently set and monitor output parameters in real time. The clear, bright digits are easily readable from across the lab bench, and the simultaneous display allows quick visual confirmation that both channels are operating within expected limits—particularly valuable during tracking mode operation where you need to verify master-slave alignment.

6. Comprehensive Protection for Unattended Operation
Beyond standard OVP, OCP, and overtemperature shutdown, this dual-channel linear DC power supply includes reverse polarity protection—a critical safeguard that prevents damage if output leads are accidentally connected backwards. This is especially important in teaching laboratories where novice users may miswire circuits, or in production environments where rapid testing can lead to connection errors. Short-circuit protection immediately limits output current to safe levels, allowing the power supply to recover gracefully once the fault is removed. Together, these protections enable safe, unattended burn-in testing and overnight data logging.

7. Output ON/OFF Switch with Preset Storage for Efficient Workflows
Each adjustable channel is equipped with a dedicated output enable/disable switch, allowing you to preset voltage and current values before energizing the load—eliminating potentially damaging startup transients. In addition, each channel stores 3 groups of parameter presets, enabling one-touch recall of commonly used configurations. For production test stations that cycle through multiple product variants, this feature dramatically reduces changeover time and minimizes the risk of human error. The preset memory retains settings even after power-off, ensuring that your preferred configurations are ready the moment you power up.

8. Intelligent Temperature-Controlled Cooling for Quiet Labs
The internal fan operates with variable speed based on real-time thermal conditions. At light loads, the fan spins slowly, producing minimal acoustic noise—a welcome feature in shared research spaces, university teaching labs, or overnight testing environments. Under sustained full-load output, the fan ramps up to maintain safe internal temperatures, protecting the massive transformer and heatsink array that define this linear power supply's thermal design. This intelligent cooling not only extends fan lifespan but also reduces dust ingress compared to always-on fans, keeping the interior cleaner for longer.

9. Rugged Construction and Thermal Stability for Continuous Duty
Weighing approximately 9 kg, the VICTOR 3303 and 3305 are substantially built—a direct reflection of their linear power architecture. The oversized transformer and large aluminum heatsinks provide the thermal inertia needed for continuous full-load operation without derating. Unlike compact switching supplies that may throttle back under thermal stress, this dual-channel linear DC power supply maintains its full specified performance even during extended burn-in sessions, giving you confidence in test results that require hours or days of stable power delivery.

10. Wide Application Versatility Across Industries
From powering operational amplifier test circuits and piezoelectric sensor excitation to serving as the primary bench supply for microcontroller development, battery simulation, LED driver validation, and automotive electronics testing, this linear DC power supply adapts seamlessly to diverse scenarios. The fixed outputs are particularly valuable for providing auxiliary standby power in complex test systems, while the tracking capability simplifies the creation of balanced bipolar supplies (±15V, ±12V) for analog signal conditioning—all within a single, cost-effective instrument. For educators, the clear front-panel layout and built-in protection make it an ideal teaching tool for demonstrating fundamental DC circuit concepts.