Ferrite Inductor Tolerance

[Archimedes' Lever]

Yup.

Maybe they have a different release process for new stuff even though it
typically _changes_ a product from previous to next generation. Having
two different release processes doesn't strike me as particularly smart,
but who knows

ECO is NOT for a "release", and not all releases are next gen designs
of previous work, idiot.

Two proofs that you are chasing your own tail.

 

[[email protected]]

ECO is NOT for a "release", and not all releases are next gen designs
of previous work, idiot.

AlwaysWrong is , *SURPRISE*, wrong again. It is an engineering change to the
database so an Engineering Change Order is necessary. It's really that
simple, AlwaysWrong. You should know simple, by mirror.

Two proofs that you are chasing your own tail.

DimBulb just can't avoid the hind-end references.

 

[[email protected]]

The ECO process is for changes made to a design, not the original
document.

AlwaysWrong is *ALWAYS* wrong. No shock, though.

 

[Nico Coesel]

It seems that you have never dealt with the electronics industry for
the last 50 years.

Matching and culling was REQUIRED in many instances due to so many
variables that were around back then. You have no clue. You also have
no clue as to how such needs and tasks (and designs) were optimized to
minimize losses.

One of my former teachers had an interesting statement where it came
to tolerances:

"Electronics is the art of cancelling component variations."

IOW: design smart and tolerances are not a problem at all.

 

[[email protected]]

One of my former teachers had an interesting statement where it came
to tolerances:

"Electronics is the art of cancelling component variations."

IOW: design smart and tolerances are not a problem at all.

This works on chips, but not boards. It's pretty tough to cancel independent
variables.

 

[Archimedes' Lever]

One of my former teachers had an interesting statement where it came
to tolerances:

"Electronics is the art of cancelling component variations."

IOW: design smart and tolerances are not a problem at all.

Which is why my original response was that there was no need for such
levels of precision in inductors.

Now we have come full circle. Or is it fool circle?

 

[[email protected]]

Which is why my original response was that there was no need for such
levels of precision in inductors.

Now we have come full circle. Or is it fool circle?

With you in the middle, it's a fool's circle jerk.

 

[Ian Bell]

Then why don't you ask them?

I have asked them. What I am asking here is what is typical/normal and
what are the contributing factors.


Cheers

Ian

 

[Ian Bell]

Having designed several custom inductors and transformers, the largest
tolerance contribution came from the core material. Not the dimensions,
those are very precise, but from the materials properties.

Thanks Joerg, that is exactly the sort of thing I was looking for. I
have heard the Al can vary by 20% for some core types. has this been
your experience too?

Cheers

Ian

 

[Ian Bell]

Which is why my original response was that there was no need for such
levels of precision in inductors.

Now we have come full circle. Or is it fool circle?

I am confused. I never mentioned a value of inductance tolerance, I
merely asked what were typical values for it.

Cheers

Ian

 

[Joerg]

Thanks Joerg, that is exactly the sort of thing I was looking for. I
have heard the Al can vary by 20% for some core types. has this been
your experience too?

Yes, 20% is quite common, often 30%. It depends on where you get the
core material from. It can be quite constant for hundreds of cores and
then all of a sudden there is a jump to another value. IOW, you cannot
rely on measurements and extrapolate. At least not for longer or larger
production runs.

 

[Archimedes' Lever]

With you in the middle, it's a fool's circle jerk.

Said the senile old fucktard that cannot even formulate a contributory
response... ever.

 

[[email protected]]

Said the senile old fucktard that cannot even formulate a contributory
response... ever.

There is no such thing as a "contributory response" from someone who is
*always* wrong, AlwaysWrong.

 

[Archimedes' Lever]

Ground-gap pot cores can be pretty good. Not cheap.

John

Specified pre-gapped core orders ARE cheap. We used to get them all
the time.

We would also buy zero gap, and gap the set ourselves.

Gap is important when conditioning oscillator circuits, particularly at
zero crossing points of transistor/FET pairs.

 

[Ian Bell]

Yes, 20% is quite common, often 30%. It depends on where you get the
core material from. It can be quite constant for hundreds of cores and
then all of a sudden there is a jump to another value. IOW, you cannot
rely on measurements and extrapolate. At least not for longer or larger
production runs.

Very interesting Joerg. I have also heard some winders over wind then
remove turns until the correct inductance is achieved.

Cheers

ian

 

[Ian Bell]

What do they suggest as normal tolerances? What can they do for more
money?

John

They replied "They are 10%..... but measured inductance usually varies
with level and frequency."

This make is half the price of similar inductors made by Sowter. Neither
specifies inductance tolerance on their respective web sites. I think
I'll ask Brian Sowter what tolerance his are. I would hope they are
rather better than 10% for twice the price.

Cheers

Ian

 

[Archimedes' Lever]

There is no such thing as a "contributory response" from someone who is
*always* wrong, AlwaysWrong.

The remark was a reference about you, dumbfuck.

 

[Archimedes' Lever]

If his parents had read that last ECO, dimmie would have been born
human.

Said the utter retard that claims to be such a patriot, yet makes
stupid remarks like this about people.

You are not a patriot, dumbfuck, you are the antithesis of patriotism.

 

[Joerg]

Very interesting Joerg. I have also heard some winders over wind then
remove turns until the correct inductance is achieved.

Yes, I did that as well. Just had gotten my first PC in the 80's and a
friend had a crude piece of software that acted like a spreadsheet,
under DOS and all text-based. This allowed to enter a formula, measure,
enter the number of wound turns and it would tell me how many to remove
to get to the target inductance. Took a long time to calculate (until I
forked over a serious chunk of cash for a Cyrix math coprocessor), today
it would probably be under a millisecond

 

[Ian Bell]

Yes, I did that as well. Just had gotten my first PC in the 80's and a
friend had a crude piece of software that acted like a spreadsheet,
under DOS and all text-based. This allowed to enter a formula, measure,
enter the number of wound turns and it would tell me how many to remove
to get to the target inductance. Took a long time to calculate (until I
forked over a serious chunk of cash for a Cyrix math coprocessor), today
it would probably be under a millisecond

LOL

Cheers

Ian