As a variable transformer, often referred to as a variac, it lets [Lajt] select how ... that the write-up isn’t meant as a tutorial for building your own, but that shouldn’t stop you from ...

The inside of a variac looks like a giant rheostat. There is a single winding which is partially exposed so that the movable wiper can make an electrical connection. The primary connection of the ...

As a variable transformer, often referred to as a variac, it lets [Lajt] select how ... that the write-up isn’t meant as a tutorial for building your own, but that shouldn’t stop you from ...

Set up the posts and sockets. Cut off a couple of metres of wire. Secure the wire to the posts. Make sure the variac is off. Plug the demo into the variac and the variac into mains power. DO NOT touch ...