From: Richard Prosser <rhprosser@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Mon, 13 Jul 2020 13:36:10 -0700
Subject: Re: [EE] Microwave Oven Transformers
Thread-Topic: [EE] Microwave Oven Transformers
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Even with the welds cut I'd thought that the laminations would be tight
(Not fall apart). They may be epoxied in place as well. Otherwise there
would be a strong buzz when operating. I haven't used microwave
transformers (yet), but had a holiday job assembling speaker transformers
and power supply chokes.
RP

On Tue, 14 Jul 2020 at 08:17, Bob Blick <bobblick@outlook.com> wrote:

> Yes, that's why I thought it might be relatively easy, assuming everythin=
g
> didn't fall apart when I cut through the welds. This guy seems to have
> achieved it:
> https://www.youtube.com/watch?v=3DrCqddXhoP4E
> Cheerful regards, Bob
>
> ________________________________________
> From: piclist-bounces@mit.edu <piclist-bounces@mit.edu> on behalf of Alan
> Pearce
> Sent: Monday, July 13, 2020 12:51 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Microwave Oven Transformers
>
> I would have thought that a DC choke would not want the E and I
> laminations interleaved, rather an air gap to limit saturation of the
> core.
>
> On Mon, 13 Jul 2020 at 18:39, Denny Esterline  wrote:
> >
> > Personally, no. But the internet is full of people that have taken out
> the
> > secondary windings and wound on 2-3 turns of heavy wire to produce a sp=
ot
> > welder.
> > Google around a bit on DIY spot welder and I'm sure you find lots of
> people
> > hacking up these transformers in interesting ways. Probably something
> > relevant to be learned there.
> >
> >
> > -Denny
> >
> > On Mon, Jul 13, 2020 at 9:23 AM Bob Blick  wrote:
> >
> > > I am in need of a large DC choke and thinking about making one from a
> > > microwave oven transformer. It appears that the E's and I's of the
> core are
> > > not interleaved so all I need to do is cut the weld holding the core
> > > together and it should fall apart. Hopefully in just two pieces. Then
> I can
> > > strip out the windings, put my own winding on, and, most importantly,
> > > sandwich a spacer so I have a gap (I said this was a DC choke).
> > >
> > > Anyone here ever play with microwave oven transformers at this level
> and
> > > learned any hard lessons?
> > >
> > > Thanks, Bob
>
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