Re: [CAD_CAM_EDM_DRO] Thoughts on PC Based Control Retrofit....pictures of the specimen

Hi Tim,

I'd hate to pay shipping on a transformer, so I'll check out the local
supply (repair shops) first. I've fixed one microwave, and I've got one
in the garage that is not obvious how to get into. An old Amanna. Wife
loves it, but she has a built in now.

My F204's are a little small. Looks like 12v @ 8a. each.

As long as the transformers are identical, I'd parallel them before the
bridge. Hay, I'd be happy with ONE of those transformers!

Alan KM6VV


Tim Goldstein wrote:

>
> Dan is offering 24 V 10 amp transformers in his power supply kits. The past
> talk on microwave transformers revolved around cutting off the high voltage
> winding and rewinding to get the voltage you want. Total uneducated guess is
> that a rewound microwave transformer built to give 48 V out would be good
> for 10 - 15 amps. If you just do some cruising of the neighborhoods on trash
> night you can find plenty of dead microwaves. It is most common for the
> controls or the diodes to fail, not the transformer. I have also been told
> they are pretty easy to get if you talk to an appliance repair shop. People
> just dump them when they hear what it costs to fix compared to replace.
>
> I am going to make my 72 V power supply from a pair of 48 V 10 amp
> transformers I have on hand and parallel them for the amperage. Anyone have
> an opinion on whether it is better to parallel them before the rectifier or
> to use separate rectifiers and parallel the DC?
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> > Hi Tim, Matt, Dan,
> >
> > I don't have the BIG IRON to drive, but I was thinking of finding a
> > transformer for an 70-80v supply. I have several F204 transformers that
> > I could hook up in series (tacky!). I'd like to find a better
> > solution. Did someone mention microwave transformers sometime back? I
> > knew I should have bid on those ovens!
> > Dan Mauch (Camtronics) had some power supply kits for servo systems, I'm
> > checking with him to see what he has.
> >
> > So I'm looking for a better transformer too.
> >
> > Alan KM6VV