Aug 19, 2018 · Hello there, A variac is a transformer with variable secondary winding turns. That means the applications are almost endless. Since in it's main uses it lowers power to AC …

Dec 27, 2017 · Variacs are not isolated from earth. The variac pictured can put out 130V ac, referenced to earth ground. An isolation transformer is not referenced to earth making circuits …

Mar 25, 2012 · A Variac does indeed have just one winding. But it doesn't have a rheostat. The knob controls a brush slider which moves along the exposed winding to vary the tap point and …

May 13, 2016 · I was in my teens some 40 years ago and somehow managed a 3A Variac for free and a 1 KW isolation transformer for like $10.00. I added an Analog voltmeter and ammeter as …

May 18, 2024 · I have a pretty old variac. It blew a fuse so I opened it up and about 1/4 of the winding looks burnt. So I assume there's a short in there. Is there any way to repair this or is it …

Jun 15, 2016 · OK, I have completed my duel variac project as seen here. Each one works fine on its own, complete with amp and voltmeters, switch and fuse. Truth is I haven tgotacluehow → …

May 9, 2011 · I cleaned the variac with an eraser, didn't seem to make much difference, looking at the contacts it looks like the silver coating has been worn off and it's down to the copper wire, …

Aug 26, 2012 · Here is what I got 10amp 120 variac + 35amp 800v full wave rectifier + 450v 3500uf caps Will this work as a 0-120v dc power supply? will it provide a clean dc current? if …

Jan 13, 2015 · A rheostat is a variable resistor and a variac is an adjustable auto-transformer. Not likely to make one from the other though they both can vary a voltage but using very different …

Oct 17, 2018 · A variac is still a transformer and if you have the moveable contact at the middle position, transformer action would allow twice as much current through the contact as would …