Just got one for use with a fret burner. Since it is a power supply usable several ways, is it a viable idea to put a dimmer switch between the Variac and whatever is being powered? That way you could set the voltage on the Variac, but do the controlling with the dimmer,  the dimmer maxing out at the set voltage. With proper operation, you'd never blow anything up, the power can never go overlooad.

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Not sure why you would need one. Wood burners don't use that much energy. 40 to 60 watts. Around the same power usage as a 60 watt light bulb. A dimmer switch at a medium setting would make your wood burner useless. Think of it as temp is equal to energy used. The lower the energy the cooler the tool will be.  

Guessing a fret burner is what's used to burn fret lines in with. 

I should have been clearer. I'm gonna build one of these...

https://www.youtube.com/watch?v=5_8RURFh_kc

My point is that as I described, I think that if the wire needed X, and the variac is set to X, the dimmer might become sort of a safety, the final output never exceeding X no matter what the variac is set to...

A variac  is a big dimmer itself, why would you need another? 

To set a limit.

Not to ruffle any feather here but what I saw in at video was someone doing something incredibly dangerous and stupid. It's one of those things that just because it can be done doesn't mean it should. There are far better, safer and cheaper was to get the same thing done. 

Please explain...

First. There is no protection between him and that wire. No protection if that wire should explode. I've seen what happens when a small piece of heated material enters the body. It causes a very wide and deep burn. That's a sorry way to lose a hand. Even if he accidentally touches that wire he could lose the use of a finger. 

Second. He has open current within reach. Ever hear of a taser? They are DC current too. People can die from a taser strike. What he has in front of him has way more current flowing through it. He is risking his life.

Bump...

Is there a safe way in your opinion to create such a device?

Completely incase both the electrical hazard and the heat hazard so there's no way to come in contact. This would also insure no moisture would touch the heating element. You would have to come up with a way to line the fretboard up without ever directly looking at the element. Possibly a templet and peg system for each scale length needed. 

Isn't nichrome wire made to be filament? Labeling says it's good to 2550F...not that I'd ever be up there...

Touching the business end of a soldering iron will burn you. Touching anything red hot will damage you. Having something like that out in the open is asking for trouble. 

Do what you want, Just saying that setup is insanely dangerous.  

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