[Arny Krueger]

"Eeyore" wrote in
message
Arny Krueger wrote:

"Patrick Turner" wrote in
message
Eeyore wrote:
Arny Krueger wrote:
"Eeyore"
wrote
west wrote:

Did you know this about plastic bobbins?
While reading a Jantzen ad I notice that they
claimed to "not make coils wound on plastic bobbins

So what do they use ?

due to the risk of microphony." I can only think
that perhaps coils in speaker crossovers might be
susceptible.

Why ?

Sounds fairly nutty to me for sure.

Agreed. Note that Pat Turner has to ignore the fact
that coils wound on plastic bobbins can be
encapsulated in epoxy or dipped in varnish.

Did I have to ignore this? was I forced to ignore it?
By whom?

Nice job of backpedalling, Patrick.

Cossover coils can be wound WITHOUT ANY BOBBIN AT ALL.

No they can't. Coils in finished products that lack
bobbins were wound on temporary bobbins. I guess you've
never been in a coil factory, Patrick.

Its probably difficult for the DIYer to achieve because
how do you hold the wire
in place as you wind it and after you have wound it?

You use a temporary bobbin, Patrick. I can tell that you
never studied machine tool design or industrial
engineering and have never been in an electrical or
electronics factory.

Isn't the 'official' name for such a temporary bobbin a
mandrel ?

That is one common kind of temporary bobbin. It's a many-to-many
relationship.