Beijing Liuyi DYY-7C Constant Current/Voltage Electrophoresis Power Supply

Overview

The Beijing Liuyi DYY-7C is a microprocessor-controlled constant voltage/constant current electrophoresis power supply engineered for precision and reliability in Western blot transfer, SDS-PAGE, native PAGE, and other slab-gel electrophoresis applications. It operates on the fundamental principle of delivering stable, programmable electrical output to drive charged biomolecules—such as proteins or nucleic acids—through porous gel matrices under controlled field conditions. Designed specifically for semi-dry and wet-tank transfer systems, the DYY-7C ensures consistent electroblotting efficiency by maintaining set parameters despite fluctuations in gel resistance or buffer conductivity. Its switching-mode power architecture enables high energy conversion efficiency, minimal thermal drift, and low electromagnetic interference—critical attributes for reproducible transfer kinetics across multiple gels or extended run durations.

Key Features

• Four independent parallel output channels enable simultaneous operation of up to four electrophoresis units—ideal for high-throughput laboratories performing replicate transfers or multi-gel experiments.
• Real-time digital monitoring via backlit LCD displays voltage, current, and countdown timer concurrently—eliminating the need for external multimeters or manual timing.
• Microprocessor-based control supports precise stepwise adjustment during active runs, allowing dynamic optimization of transfer conditions without interrupting electrophoresis.
• Non-volatile memory retains user-defined protocols—including voltage/current setpoints and timer values—enabling rapid recall of validated methods between sessions.
• Comprehensive safety architecture includes automatic shutdown and audible/visual alerts for over-voltage, over-current, over-load, and load-mismatch events—protecting both equipment integrity and sample viability.
• Wide output range (2–300 V, 5–2000 mA) accommodates diverse electrophoretic techniques—from low-voltage native protein separations to high-current semi-dry transfers—while maintaining ±1% output stability across the full range.

Sample Compatibility & Compliance

The DYY-7C is compatible with standard vertical and horizontal electrophoresis tanks, including those used in mini-gel, midi-gel, and large-format transfer systems. It supports common buffer systems such as Tris-Glycine, CAPS, and NuPAGE MOPS, and performs reliably with both PVDF and nitrocellulose membranes. While not certified to IEC 61010-1 or UL 61010B as a standalone medical device, its design adheres to general laboratory safety requirements for Class II electrical equipment. The unit meets GB/T 14710–2009 (Chinese environmental testing standards for lab instruments) and incorporates isolation barriers compliant with basic insulation requirements for low-voltage DC output circuits. For GLP/GMP environments, its memory function and parameter traceability support method documentation per internal SOPs, though it does not include FDA 21 CFR Part 11-compliant electronic signature or audit trail functionality.

Software & Data Management

The DYY-7C operates as a stand-alone instrument without proprietary software or PC connectivity. All configuration and execution are managed locally via front-panel membrane keys and the integrated LCD interface. Parameter settings—including target voltage/current, run duration, and channel activation—are stored in non-volatile memory and persist through power cycles. No firmware updates or driver installations are required. This architecture prioritizes operational simplicity, reduces IT infrastructure dependencies, and eliminates cybersecurity risks associated with networked lab devices. For laboratories requiring digital recordkeeping, users may manually log output parameters and runtime data into ELN platforms or LIMS using timestamped entries aligned with experimental metadata.

Applications

• Electroblotting of proteins from SDS-PAGE gels to membranes for subsequent immunodetection (Western blotting).
• High-efficiency semi-dry transfer of nucleic acids and proteins under constant current or constant voltage modes.
• Optimization of transfer conditions via real-time current monitoring during protocol development.
• Parallel processing of multiple mini-gel units in teaching labs or QC environments where consistency across replicates is essential.
• Long-duration native electrophoresis requiring stable low-voltage output with minimal thermal artifact.

FAQ

Can the DYY-7C be used for DNA agarose gel electrophoresis?
Yes—it supports standard agarose and polyacrylamide gel electrophoresis within its voltage and current ranges; however, it is optimized for higher-current transfer applications rather than routine DNA separation.
Does the unit support constant power mode?
No—the DYY-7C operates exclusively in constant voltage or constant current mode; power is a derived value and not a controllable parameter.
Is remote control or computer interfacing possible?
No—the device lacks RS-232, USB, or Ethernet ports; all operation is local and manual.
What maintenance is required?
No scheduled maintenance is specified; periodic inspection of output terminals and ventilation grilles for dust accumulation is recommended.
How does the load-mismatch protection function?
The system continuously monitors output impedance; if detected resistance falls outside expected bounds (e.g., short circuit or open circuit), it triggers immediate shutdown and error indication.