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

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

The review works through the practical questions a buyer should be asking 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 actually 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 gets attention too: 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 is about matching the tool to the task. If you need high voltage occasionally and cannot justify a lab grade instrument, a unit like this is a pragmatic answer, provided you understand its accuracy limits and treat the output with care.