Total posts : 45366
An old trick I used to use before finding a Variac for my projects was to use two filament transformers wired back to back as an isolation transformer. I.E. go in to one transformer with 110 VAC hook it’s 12 VAC (could be any voltage out as long as it matches the voltage of the winding you hook it to in the second transformer) output to the 12 VAC connection of the second transformer and voila… 110 VAC isolated output from the second transformer. Do not exceed either of the current or power ratings of either transformer.