Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. A Variac looks like a sci-fi laboratory prop. For some reason, I ...

As a variable transformer, often referred to as a variac, it lets [Lajt] select how much voltage is passed through to the output side. There’s a school of thought that says slowly ramping up the ...

I am trying to verify that a system can run at 50 or 60 Hz and 100 - 240 VAC. Can a Variac be used change both output frequency and voltage or just voltage? The typical solution to your problem ...

The folks at TOG, Dublin Hackerspace, have a large variac. A variac is a useful device for testing some fault conditions with AC mains powered equipment, it allows an operator to dial in any AC ...

Visually, the light bulb colour goes from an orange glow to a bright white glow as the voltage is increased. Place the variac on a horizontal surface near a power outlet. Connect the light bulb to the ...