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

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 ...

Several folks have reported bad relays lately. I've looked through the emails and it appears many of these folks are using a VAriac to bring up the PS. The relay spec indicates the engage and dropout ...

As the voltage is increased, the current increases which results in an increase in temperature of the filament. The increase in temperature affects the range of wavelengths emitted by the light bulb.