Variac .


2011-04-29 8:37 pm
When is a Variac used as a useful tool ?

You can do lots of things with it, like: adjust the input line voltage of a circuit to spec;
bring up a circuit slowly to allow old capacitors to burn in; check for circuit stability
when powering up/down or with line sag/boost; test circuits that need lower input voltages
than the AC line, without a step down transformer.
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