Homebrew PCBs

Not an "autotransformer" 

You probably want to stay away from an "autotransformer" in this situation because of line isolation factors. 

A simple "step down" of "step up transformer would be a safer choice, where there is a primary and 
a secondary winding configuration. 

Do your homework before delving into this transformer application. 

Regards, 

Roland F. Harriston, P.D. 
*************************** 

----- Original Message -----

From: "jim.strohm@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com> 
To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com> 
Sent: Wednesday, February 24, 2016 9:29:25 AM 
Subject: RE: [Homebrew_PCBs] Re: drill pcb 



Depends. Most of them are autotransformers. In this case, the full winding is used for 220 and it's tapped halfway down for 110. I got my last two for free on CraigsList. 


---In Homebrew_PCBs@yahoogroups.com, <keethpr@...> wrote : 


Aren’t most of these converters to convert 220 down to 120 ? International voltage converters are widely available in the states.