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19:19
YouTube
George Christofi
How to make a variable AC voltage supply with a Variac and isolation transformer
This is a project that has been in the making for a long time. I show how to make a variable AC voltage supply with a Variac and isolation transformer, a metal box plus some switches and a contactor. A variable AC supply is very useful to bring up valve equipment slowly as well as to provide a supply for other projects requiring lower voltage ...
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