SDG #085 Wanptek High Voltage 120V DC 3A Bench Power Supply

High voltage output is the one thing most budget bench supplies cannot provide. Typical switching units top out around 30V or 60V, which is adequate for logic and battery work but useless for testing LED strings, valve heaters, electrostatic circuits, EL panels or anything else that needs three digits of volts. The Wanptek unit covered here reaches roughly 120V at up to 3A, which places it in an unusual niche for the money.

The review works through the practical questions a buyer should ask about a cheap high voltage supply. How clean is the output, given that these are switch mode designs rather than linear? How closely do the front panel readouts track a trusted external meter across the voltage and current range? Does constant current mode behave like a proper current limit, and how quickly does it transition when a load is applied or shorted? There is also the matter of what happens at power on, since an uncontrolled overshoot at 120V is a far more expensive mistake than at 30V.

Build quality receives attention as well: enclosure and ventilation, fan behaviour and noise, the quality of the output terminals, and the encoder and button layout, which is often where these units feel cheapest in daily use. Just as important is the safety side, because 120V DC on exposed binding posts is genuinely hazardous and deserves more respect than the average hobby supply.

The conclusion concerns matching the tool to the task. For occasional high voltage needs where a laboratory grade instrument cannot be justified, a unit like this is a pragmatic answer, provided its accuracy limits are understood and the output is treated with care.