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Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
does anyone know why some variacs have taps on their windings? this is a 120V variac, so my assumption that the tap is 120 and the rest of the windings go to a higher voltage.
also, there is a second tap on the other side of the variac
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Most variacs have a tap that you can connect the incoming mains to for boosting. For instance on a 240V one, you can go from 0 to 240 by connecting the whole winding up, and 0 to 270V by using the tap.
Also, I've got one that has a 24V tap at the neutral end for powering a pilot lamp.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Variacs can be used as variable inductors too. With the tap and a few other parts, you could make your variac into a variable sin oscillator to control the speed of syncronous motors like the one used on a Hammond organ. "Hammond Organs- can never be tuned, yet never can go out of tune"
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Variac tap?
