Re: 7834/7934 HT transformer

Dave Wise
 

And that's why Transformer Tape is better than Scotch Magic, it is stretchy enough to do that. My bobbin was exactly the same width as the tape, so I used one* straight-wound turn and painted the ends with dope.

There's also special narrow end-gap-filler tape sold, kind of like stretchy sticky dental floss.

Dave W.

* Actually more like 1-1/2 turns, with the retrace in the overlap.
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Craig Sawyers <c.sawyers@...>
Sent: Wednesday, October 23, 2019 2:07 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834/7934 HT transformer

I ran the tape slightly up the cheeks of the pot core former that I used to prevent fall in.

Craig

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Wise
Sent: 23 October 2019 20:06
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834/7934 HT transformer

Thanks.

What did you do at the ends to prevent wire from falling in and touching previous layers?
(That's why I applied corona dope, more as a mechanical space filler than insulator/impregnant.)

Dave
________________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Craig Sawyers <c.sawyers@tech-
enterprise.com>
Sent: Wednesday, October 23, 2019 10:36 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 7834/7934 HT transformer

3M 1350 tape, 1 mil film (2.5um) with a total thickness of 2.5 mil (6.3um) including adhesive.
Polyester with acrylic adhesive.

Voltage rating 5,500V.

I used two turns between layers.

Craig

Join TekScopes@groups.io to automatically receive all group messages.