SDG #099 IanScottJohnston's PDVS2mini Precision Voltage Source

The PDVS2mini is a compact bench reference from Ian Johnston that generates a precisely settable DC voltage, plus a current source mode, in a package small enough to sit beside a multimeter rather than occupy a whole shelf. This video explains what the unit is, how it is constructed, and where it fits in a hobbyist or repair bench workflow.

The interesting aspect of a product like this is not raw specification but usability. A precision voltage source depends on how quickly an exact value can be set, how stable that value stays as the unit warms up and as load changes, and how trustworthy the displayed figure is against a known good reference meter. Those are the practical questions covered, along with the resolution available across the output ranges and how the controls behave when small increments rather than large jumps are needed.

Because this is a kit derived design rather than a mass produced instrument, construction and component choice matter. The review examines the board, the enclosure and the general finish, which is where small run products often either impress or disappoint. For anyone calibrating ADC inputs, checking meter accuracy, testing sensor front ends, or feeding a known stimulus into an analogue circuit, the value proposition is straightforward: a dedicated reference is far more convenient than borrowing a bench supply and trimming it by hand.

The review is relevant to anyone weighing a small precision source against a higher end bench PSU, or curious how well an independently designed instrument compares with commercial equipment.