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  1. #1
    The plastic tape that covers the transformer, is it only there to protect the Windings?
    Ive seen hifi transformers laying in a plastic "cup" and it was my intention to make one of these in my 3D printer and put the transformer in it.

    Why then? The Cables needed som work so i had to take the plastictape off.

    Is there any good reason that i shouldnt?

  2. #2
    why did you need to work on the transformer ?

    if you only wanted longer wires then I would of spliced extension wiring to the transformer

    if you removed some turns from a winding to lower the output voltage
    then I would replace the original tape with new heat resistant tape
    eg
    glass cloth electrical tape with thermosetting poly acrylate adhesive/ heat class F

    Any 3D printed support needs to withstand the temperature the transformer runs at

    your probably looking at a 3D plastic part that needs to be safe at 130 to 150 C
    and not prevent the natural cooling of the transformer

    John

  3. #3
    The rubbercoat of the wires was falling off so to fix this I had to take the tape off.
    I just did a little research and found out that I could just buy one of these cups, they are made of metal.
    I thought that if i put the cover on i dont have to rewind the protection tape.

  4. #4
    OK , that makes sense renewing the old insulation
    I would still replace the tape

    Is this Mounting Disc the type of thing your looking out ?
    https://uk.rs-online.com/web/p/mounting-kits/6719208/

    using a Neoprene Disc
    https://uk.rs-online.com/web/p/mounting-kits/6719211/

    helps to even out the pressure on the transformer

    just watch out you don't accidently form a shorted turn by
    connecting the top metal mounting disk to the bottom disk or chassis

    John
    Last edited by john swift; 02-09-2019 at 01:21 PM.

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  6. #5
    Reasons toroids are potted in a plastic case include reducing audible hum (potting compound locks the windings solid) and because they may look smarter! - important for HiFi. To do it properly you need a vacuum potting chamber to drive the resin inbetween the turns of wire. If the primary winding is on the outside you'll need some kind of insulation when potting in a metal can to preserve the breakdown specification - better to have the secondary on the outside in such designs.

  7. The Following User Says Thank You to Voicecoil For This Useful Post:


  8. #6
    Yes, i think im gonna go with that and skip the cover...
    Sometime i read about how not to mount one of these transformers but i dont remeber now.
    Would this be a bad way? The top metal disc would be connected to the cabinetchassis if i do it like this.
    Click image for larger version. 

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  9. #7
    Thanks for the info, i decide to go with the tape instead!

  10. #8
    Sorry i forgot to Reply with quote...

  11. #9
    yes, the diagram in post 6 is the usual way to mount an open toroidal transformer

    if its fitted in a low profile metal enclosure just make sure the lid can not touch the bolt head and form a shorted turn !

    John
    Last edited by john swift; 02-09-2019 at 04:27 PM.

  12. #10
    Quote Originally Posted by john swift View Post
    yes, the diagram in post 6 is the usual way to mount an open toroidal transformer

    if its fitted in a low profile metal enclosure just make sure it can not touch the bolt and form a shorted turn !

    John
    Feeling stupid now but, make sure what cant touch the bolt?
    The chassis would be in contact with the screw by mounting it in it or am i missing something?
    Last edited by JW1977; 02-09-2019 at 04:30 PM.

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