Re: DEC H7822 power supply

[Paul Koning via cctalk]

> On May 13, 2022, at 3:36 AM, Christian Corti via cctalk 
> <cctalk@classiccmp.org> wrote:
> 
> On Thu, 12 May 2022, Peter Coghlan wrote:
> ...
>> A variac does not provide isolation.  If it is not wired correctly, it is
> 
> Good "variacs" provide galvanic isolation from the mains, i.e. they are not 
> autotransformers.

There may be variable transformers that aren't autotransformers, but I've never 
seen one.  The commonly seen Variac devices (either that brand, or analogous 
devices from other makers) are autotransformers.  

It should be obvious by inspection which kind you have, and take precautions as 
needed.

        paul