Jump to content
Electronics-Lab.com Community

Air core inductor forms

Recommended Posts

Hello all,

I hope you can give me advice/information an where I can get some coil forms for construction of a 1mH and .22mH air core crossover inductors.  Yeah, I could buy them a lot easier from a couple sources, but I'd like to see if I could build them for fun, first!  I had been hoping to salvage some from an old speaker, but have yet to run across any.  I used to throw these things out regularly, but have yet to see any now that I need them!!!!  Murphy's Law strikes again!!!

The forms need to have a 1.6" (1.5") and 1.16" (1.25") core diameters, and the heights need to be .4" and .3" respectively,  per an inductor program I found.  The core diameter is I bit bigger that I want, but it is due to the magnet wire diameter I am going to use (22guage).  This will put the power rating of each at about 100w RMS.

I don't have a pic of the form, but if you can picture an empty fishing line spool, this is what they look like.

I've emailed several places, including Amidon, for forms and/or information, but still have had no reply's.

I am looking for your guy's advice first before attempting another avenue.



Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...