Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

previous by date index next by date
previous in topic topic list next in topic

Subject: Re: [Homebrew_PCBs] Re: drill pcb

From: rolohar@...
Date: 2016-02-24

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.
∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗

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.