A Variac (also known as an Autotransformer) is a variable transformer, which allows the user a convenient way to control the power to an AC appliance. Â In our context, it’s typically used to adjust the output of a heating device. The variac currently at the Makery is a 20-amp model manufactured by PowerStat. Â We’ve configured it to scale voltage only in the down direction, so that the output range is 0-110vac (or whatever line voltage happens to be). Â The transformer is outfitted with standard AC outlet fittings, and is mounted to a board for easy transport. Â It should be noted that this transformer is NOT isolated, so the output could still be hazardous, regardless of how low the voltage happens to be set. Â As with most other equipment, the variac is stored in the TOOLS cabinet.