Metallurgical Crossover Question

[Skywave-Rider]

Are brass screws good to use in crossovers when fastening coils down to a wooden panel (using nylon zip ties, for example)? Brass is non ferrous, yes?

[Chas]

Brass non-ferrous? In theory, yes. Personally I use either ty-wraps or a glue gun or both, only.

Note that inductors inductively couple, so it's good practice to leave plently of space between them and keep them at right angles from each other.

[Skywave-Rider]

Thanks, Chas.
On the one I recently made I used hot glue only. But I'm thinking for long term that's not good enough. So maybe a combination of hot glue and nylon -- but on a wooden board I guess just drill through for the zip ties. Ideally I want to screw down a nylon strap of some sort directly to the top of the board.

[Chas]

-- but on a wooden board I guess just drill through for the zip ties.

Yup, That's exactly what I do.

[Baron030]

Hi Skywave-Rider

Here is a trick that I use for mounting large caps and coils to 3/8" birch plywood circuit boards with nylon zip ties. First, I drill holes through the board. And then using a sharp knife, I whittle a slot between the holes. So, that the zip ties are recessed flush with the board’s bottom surface. It helps to round the holes bottle edges, so that the zip tie does not have to bend too sharply as it goes through the hole. It will only take a few minutes of whittling and test fitting for the zip ties to lay flush with the bottom of the board.
Pictured below is an example.

Baron030

[Skywave-Rider]

Baron030,
Hey, that looks very neat!
Should I assume it's 3/8" birch plywood circuit boards? I notice the coil is alone on its own board. Do you remount these on a larger board with other components?. Please forgive me, I have no woodworking skills, LOL, feel free to ridicule me..... But I want to steal your technique.