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  • Removing resin from sealed 49:1 unun box

    From Boris Gonev@2:240/8001 to All on Wednesday, June 18, 2025 21:24:03
    Hi All,

    After I do not know how many years, I'm back on FidoNet
    So, back to the primary topic:
    Recently I've purchased a 49:1 unun from a manufacturer, but I am not satisfied of it's performance (compared with another 49:1 transformer, the SWR is notably higher). Therefore I plan to dissassemble it completely and use the ferrite for another project, but the main problem is that the ferrite inside the box is sea led with a resin. I would like to hear your opinions or experience, how to safe ly remove the resin without damaging/destroying the ferrite ?

    73 de Z32X

    --- Mystic BBS v1.12 A43 2019/03/03 (Windows/32)
    * Origin: BlackICE BBS (BlackICE.BBSindex.com:23) (2:240/8001)
  • From Rug Rat@1:135/250 to Boris Gonev on Saturday, July 05, 2025 22:44:05
    On Wed 18-Jun-2025 9:24p, Boris Gonev@2:240/8001.0 wrote:
    Hi All,

    another project, but the main problem is that the ferrite inside the box
    is sea
    led with a resin. I would like to hear your opinions or experience, how to safe
    ly remove the resin without damaging/destroying the ferrite ?

    The only answer I could think to give you for your question, is to find a video on YouTube on repairing the old Commodore 64 PSU's. It is the only thing I can think of to compare it to.

    What I got from a quick search is, "Using heat, tools, or solvents to seperate the resin from the componates." So a lot of accetone and a dremmel tool?

    Sorry I could not be more help.

    Rug Rat (Brent Hendricks)
    Blog and Forums - www.catracing.org
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    --- CNet/5
    * Origin: The Rat's Den BBS (1:135/250)