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 devices, whether or …

Finding the "sweet spot" on the variac linked to the gain and volume settings on the amp takes a little bit of experimentation, however, the end result has always proven valuable in terms of sound quality …

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 thus the …

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 not , what else is …

Jul 18, 2005 · It's worth realizing that "Variac" was the trademarked name of a product by General Radio (that eventually became a catch-all term; " Vari able A.C.), while "Powerstat" is likewise a product …

Jun 15, 2016 · I am currently working on a project where I need variable power between 200 - 250vdc @ 4 - 8 amp range. I have (2) 0 - 140vac @5amp POWERSTAT variable autotransformers. Is there any …

May 9, 2011 · Right, got it fixed, I disassembled the variac and cleaned all the contacts (primarily a wavy copper ring that was really dirty) using sandpaper, an eraser, and acetone.

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 safer to work on …

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 well as …

May 8, 2017 · Hello! I'm building "isolation transformer+variac+dim bulb tester combo" according to plans in attached pictures (from "Mr Carlson's Lab" YT channel - It's gonna be enclosed in chassis …