Staco Energy VAR-0-100 Variable Autotransformer

The Staco Energy VAR-0-100 Variable Autotransformer is a compact, manually adjustable AC source that delivers a controllable 0–100 V output for bench testing, calibration, and electronics experimentation. Like other Staco variable transformers, it uses a single‑winding autotransformer design with a carbon brush contact that rides along a precision-ground commutator track to tap voltage at any selectable point from zero up to the winding’s maximum voltage. The model designation VAR-0-100 specifies its 0–100 V output range, providing a smooth, continuous adjustment from zero to the top end of the windings. In the broader Staco VT family, output can typically be varied from zero up to near, or slightly beyond, the input voltage, enabling easy voltage ramping for diverse test scenarios without additional power sources. This unit is well suited for laboratory and educational environments where a straightforward, adjustable AC source supports device testing, circuit experiments, and voltage regulation demonstrations.