Ferrite core mounting, U- brackets anywhere?

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Screw, spring, large diameter washer, toroid, board, lock nut. Possibly a spacer in the hole of the toroid, to keep the thing from rattling around in x and y.

The spring presses on the washer (possibly fiber or plastic, to be nice to the coil wires), to maintain tension on the toroid without breaking the core. The screw does what screws do, and the lock nut is because you can't really snug things down -- you want the spring to be compressed.

What you really want is a shoulder screw, so the screw is tight up against the PC board but has a controlled distance to the head, and maybe controls the lateral coil position to boot -- that's a short thread and a long shoulder, so it may not be a catalog item.

Have you checked with Misumi (Mitsumi?) to see if any of their semi-custom mechanical parts can be made to work?

OR...

How about a spacer, screw from underneath to hold it to the board, screw down from the top to put pressure on the spring, with a fender washer to hold the coil down? Bed the coil in hot glue top & bottom so it's nice and comfy, but doesn't depend on the glue very much at all for mechanical strength. Spacers are a lot easier than oddball shoulder screws.

flow.

finish.

appears

They even have the cool black stuff:

Yeah, but it has two downsides: Drill holes in FR4 much be rounded to make this kosher. Then, I'll have to make an elaborate and ECO-releasable hand-drawing about how to lace it, knot it, and all that. Else they'd have to hire an aircraft electrician :-)

Can't use a toroid because I couldn't get the leakage inductance down low enough.

Have to use the big square BN-43-7051 double-holer from Amidon:

They cater more to the injection-molding crowd.

Well, I need something to hold several roughly 1" square chunks of ferrite on the board, and they are fairly heavy.

For toroids, somebody makes a plastic cone-shaped thing that centers better than a flat washer. Or you might get lucky and find a rubber grommet that sort of jams into the hole. Cheap.

People often buy a rectangular potting shell and stand the toroid up inside it, on edge, and pour it halfway full of epoxy or some such. Leads or mounting studs (which can be the same things) can poke out the bottom.

Here are some mounts:

John

Cable clamp!

John

An easily-available alternative would be dental floss... typically nylon (or sometimes a PTFE as in the case of Glide) - both are materials used in the sort of modern lacing tape you describe.

They are all round :-(

That's what a friend of ours would say. He is over 80 now and when I talked with him about his job after the military he summed it up this way: "Well, I just couldn't work with civilians" :-)

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I see what you mean, they aren't very wide.

how about something like this:

-Lasse

I took a look, there is some hardware, probably nothing you can use. I did use the txfrmr brackets, bigger than the Keyelco stuff. Here is a link to the catalog.

We have a Konica-Minolta Biz Hub, set it and forget it, works great.

Cheers

Stainless steel cable ties, that's actually a darn good idea! Slotting is no problem. They just have to be thin enough so they "snuggle in" and we can tuck the excess away. There's several kilovolts of isolation in this module but no problem. Thanks for the hint.

Come to think of it, even a skinny hose clamp might work. In the US those are usually stainless steel.

"John Larkin" wrote in message news: snipped-for-privacy@4ax.com...

Magnetics Inc also has torroid mounts...

Cheers

Thanks, Martin. True, I can't use anything for this project but I saved the PDF anyhow because they have something that is very hard to find these days: Lug assemblies. On fishpaper no less :-)

When I read that catalog I felt I'd just stepped out of a time machine and was back in the 60's, the time when I wound my first transformer and all the girls listened to the Beatles all day long.

Amazing, it can scan in a buond catalog? I have one of those Brother "hub things" and it can also scan unattended, but it must be loose sheets.

Not bound, this catalog was in a loose-leaf folder. Whats neat about the bizhub 223 is it scans in color.

It's leased, free toner and they count printed sheets for the lease. Scanning is free (so to speak). Actually, it's pretty much maintenance free. We never had a problem with it or the older 350.

Cheers

Oh yeah, that's a serious machine alright. My tiny one is a table top. Does color as well but that slows it down seriously and it also cannot scan double-sided. Although the SW that came with it has some trick in there where it concatenates two scan processes accordingly. Meaning two trips to the machine, but OTH moving around a bit is healthy.