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 ...

I'm rebuilding my bench DC power supply (it currently uses a dimmer switch to adjust 115 V AC, and a large capacitor and rectifier to condition it to DC), but I want to upgrade the dimmer switch to a ...

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 would ...