Basic Constant-Voltage Electrophoresis Power Supply

What is the Basic Constant-Voltage Electrophoresis Power Supply?

A simple single-output supply with constant-voltage operation up to 300 V and about 400 mA, plus a timer. It is the economical choice for routine agarose gel runs and teaching laboratories that need straightforward operation.

Overview

The basic supply focuses on constant-voltage operation at a low cost. A single output with two or four sockets drives one or two tanks, and a dial or push-button interface sets voltage between roughly 10 and 300 V. A digital readout shows voltage and current, and a timer stops the run automatically. Overload, short-circuit and no-load detection are included, with automatic shutdown to protect users and tanks. Output power is commonly 100–150 W. The design has no programmable steps or memory, which keeps operation simple for students and occasional users. It fits agarose gels, mini vertical gels and educational experiments where constant field strength is enough, although it is not the best match for blotting or focusing work requiring constant current or high voltage.

How does it work?

An electrophoresis power supply converts mains alternating current into a regulated direct-current output. A transformer or switch-mode stage steps the voltage, a rectifier and filter create DC, and a feedback loop holds one chosen variable constant. Because the electrical resistance of a gel changes during a run as ions migrate and buffer heats, the three quantities voltage, current and power are linked by Ohm's law and P = V x I. Constant voltage gives predictable field strength, constant current keeps migration speed steady, and constant power limits heating. Most supplies switch automatically to a limiting mode when a set limit is reached. Key features include multiple outputs, programmable multi-step runs, timers, amp-hour accumulation, no-load and short-circuit detection, and isolated outputs with safety interlocks.

What are the key features?

• Constant-voltage output adjustable from about 10 to 300 V with clear digital display
• Built-in timer ends the run automatically and sounds an audible alert
• Overload, short-circuit and no-load detection shut the output down safely
• Two or four parallel sockets run one or two tanks from the same output
• Compact housing with rubber feet and cable storage suits limited bench space
• Isolated output and shrouded sockets meet common laboratory electrical safety expectations

What are the technical specifications?

A typical basic constant-voltage electrophoresis power supply configuration offers output voltage of 10–300 V DC, output current of 4–400 mA, maximum power of 100–150 W, operating modes of Constant voltage (current and power limiting), number of outputs of 1 (2 or 4 sockets in parallel) and voltage accuracy of ±2%. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Basic Constant-Voltage Electrophoresis Power Supply is used in routine agarose gel runs, teaching laboratories, mini vertical gel runs and PCR product checks. Across the wider Power Supplies class, laboratories also deploy it for agarose gel electrophoresis, SDS-PAGE and native PAGE and western blot transfer.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61326-1, IEC 61010-2-010, ISO 17025 and 21 CFR Part 11. Certification candidates for this model are CE, ISO 9001 manufacturing and RoHS; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Place the supply on a dry bench away from splash and buffer spills, and never operate it with damaged leads. Connect cables with the supply switched off and respect polarity colours. Use only tanks with interlocked lids and shrouded connectors rated for the output voltage. Verify output accuracy periodically against a calibrated meter, and keep vents clear for cooling. Output above 60 V DC is hazardous, so staff should be trained and local electrical safety rules followed. Safety compliance is typically based on IEC 61010-1 and EMC on IEC 61326-1. For regulated laboratories, schedule calibration, keep service records and store run parameters where data integrity is required.

How do I select the right Basic Constant-Voltage Electrophoresis Power Supply?

Select the basic supply when runs are routine, constant voltage is sufficient and cost matters. Choose a more capable model for blotting, focusing, or programmable protocols. In an RFQ specify maximum voltage and current, number of sockets, timer range and whether a memory or step function is needed.

How does it compare with other Power Supplies variants?

Match the power supply to the most demanding application. Gel electrophoresis of DNA usually needs up to 300 V and 400 mA, protein and blotting work need higher current, and isoelectric focusing or sequencing need 2000–5000 V at low current. Decide whether constant voltage alone is sufficient or constant current and power modes are also needed. Programmable multi-step protocols, such as ramped focusing, require memory and stepping. Count how many tanks run together, because multiple outputs share total power. Look for clear displays, automatic overload, no-load and short-circuit protection, isolation from earth, and compliance with IEC 61010-1. Check connector type and whether cables are compatible with your tanks, and consider remote-control or USB options for documentation.