> In a message dated 12/7/2007 6:05:15 PM Eastern Standard Time,
> sccook1@cox.net writes:
> Where can an individual purchase core material, paper, wire, etc? We may
> need to get serious about winding our own...
> Wonder if there is a distributor who will sell Hypersil C cores to hams.
> I would love to give it a try -- but can seem to locate anything on the
> Internet.
>
>
> I bought a nice supply of E-I laminations from Tempel Steel a number of
> years
> ago. They will sell in small quantities to hams. I bought some nice
> bobbins
Hardwood blocks make good forms.
It just depends on how much automation you want to use.
> from another place I can't remember who it was right now. I found a big
> roll of
> heavy-duty 70-lb Kraft Paper from Browncor. I was able to build a nice
> heavy
> -duty filament transformer from the parts. I haven't tried to buy a
> Hypersil
> core though.
>
> If someone wants to do more advanced work you can buy a suitable vacuum
> pump
> on eBay for $100-$150 bucks or so. Get a vacuum Bell Jar, or build your
> own,
I've seen this done using a vacuum cleaner and a metal chamber. You don't
need a high vacuum. Just enough so the varnish will fill all the voids. He
then baked them in his "first wife's" kitchen oven.<:-))
> dunk your transformer in a tub of varnish inside the jar and turn on the
> vacuum
It works even better if you put the core in a small "empty" container inside
the chamber and then evacuate it. Pipe the varnish in to the container
holding the core and then let the air back in. This does a much beter job of
eliminating voids. We do something similar when vacuum bagging fiberglass
lay-ups.
Good luck,
Roger (K8RI)
> pump. You don't have to be a rocket scientist to vacuum impregnate a
> transformer.
>
> There are lots of suppliers out there who will sell online. Just look up
> what
> you need on google.
>
> 73 Todd WD4NGG
>
>
>
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