Feedthrough PI filter Question

[Spehro Pefhany]

Anyone know what's actually inside these hermetically sealed units?

http://www.specemc.com/catalog/datasheet.asp?PN=9001-100-1017&FAM=hermetic&P=7094,7915,7906

Ordinary rectangular MLCC caps or what?
Ferrite bead or a wound inductor?


Best regards,
Spehro Pefhany

 

[Joerg]

Anyone know what's actually inside these hermetically sealed units?

http://www.specemc.com/catalog/datasheet.asp?PN=9001-100-1017&FAM=hermetic&P=7094,7915,7906

Ordinary rectangular MLCC caps or what?
Ferrite bead or a wound inductor?

Most of the time when I had to repair super-pricey lab devices I found
ratehr mundane parts in there. Occasionally "dremel-trimmed".

BTW, yesterday my wife treated me to a nice bottle of "La Fin du Monde"
from Unibroue, from your neck of the woods. Very tasty! Just make sure
not to drive after a few of those.

 

[Spehro Pefhany]

fOn Mon, 17 Mar 2008 12:48:02 -0700, Joerg

Most of the time when I had to repair super-pricey lab devices I found
ratehr mundane parts in there. Occasionally "dremel-trimmed".

BTW, yesterday my wife treated me to a nice bottle of "La Fin du Monde"
from Unibroue, from your neck of the woods. Very tasty! Just make sure
not to drive after a few of those.

Hm... a 9% Quebec "beer". Never heard of it.. too many and it really
will be the end of the world for you.
Best regards,
Spehro Pefhany

 

[John Larkin]

Most of the time when I had to repair super-pricey lab devices I found
ratehr mundane parts in there. Occasionally "dremel-trimmed".

BTW, yesterday my wife treated me to a nice bottle of "La Fin du Monde"
from Unibroue, from your neck of the woods. Very tasty! Just make sure
not to drive after a few of those.

I thought that some of those smaller feedthru filters used
cylinder/coaxial ceramic caps inside.

And speaking of not driving, try this:

http://www.kraitprestige.com/index.php

This is double-fermented beer, which is very fizzy and has a slight
champagne taste. It's very alcoholic and absolutely delicious.

Elderbrat is moving to California (finally got a tenure position, in
Fresno) and we're taking her to the Monk's Kettle tonight to
celebrate. They have 20 beers on tap, including a bunch of Belgian
stuff. The gourmet wine thing is rapidly being overtaken by a gourmet
beer fad. They have one bottled beer that's $24. The St Bernardus
prior 8 is about $9 on draft, and worth it.

John

 

[Joerg]

I thought that some of those smaller feedthru filters used
cylinder/coaxial ceramic caps inside.

Some might but the ones I saw didn't. We learned that trick in the old
ham radio days when we needed a dummy load resistor that goes to a GHz
but the bank account said "no way". Stagger a whole bunch of parts in a
nifty way on strategically placed copper snippets so it all stays
resistive. Of course nowadays copper can cost several bucks a pound,
this was in the 70's.

And speaking of not driving, try this:

http://www.kraitprestige.com/index.php

This is double-fermented beer, which is very fizzy and has a slight
champagne taste. It's very alcoholic and absolutely delicious.

Nice. I love it when beer bottles have a cork and smoke wafts off after
popping it out.

Elderbrat is moving to California (finally got a tenure position, in
Fresno) and we're taking her to the Monk's Kettle tonight to
celebrate. They have 20 beers on tap, including a bunch of Belgian
stuff. The gourmet wine thing is rapidly being overtaken by a gourmet
beer fad. They have one bottled beer that's $24. The St Bernardus
prior 8 is about $9 on draft, and worth it.

You've got two daughters? I thought you just sent her to Cornell but I
guess that must have been the younger one. Honestly I don't know what's
the appeal of a tenure track job when dad owns a nice high-tech company
smack in the middle of a city with tons of nice pubs in walking distance.

 

[John Larkin]

Some might but the ones I saw didn't. We learned that trick in the old
ham radio days when we needed a dummy load resistor that goes to a GHz
but the bank account said "no way". Stagger a whole bunch of parts in a
nifty way on strategically placed copper snippets so it all stays
resistive. Of course nowadays copper can cost several bucks a pound,
this was in the 70's.



Nice. I love it when beer bottles have a cork and smoke wafts off after
popping it out.



You've got two daughters? I thought you just sent her to Cornell but I
guess that must have been the younger one. Honestly I don't know what's
the appeal of a tenure track job when dad owns a nice high-tech company
smack in the middle of a city with tons of nice pubs in walking distance.

Yes, two. She's a botanist and a certified BMW motorcycle mechanic.
She makes motorcycle tours of the sw USA and northern Mexico,
discovering and naming new species of plants and their co-evolving
native bee species. Involves DNA sequencing and wet stuff like that.
Not especially interested in electronics. We do have a shared interest
in beer. Her rule is "one beer per wheel."

John

 

[Joerg]

John Larkin wrote:

[...]

Yes, two. She's a botanist and a certified BMW motorcycle mechanic.

Wow! Now that's a combination.

She makes motorcycle tours of the sw USA and northern Mexico,
discovering and naming new species of plants and their co-evolving
native bee species. Involves DNA sequencing and wet stuff like that.
Not especially interested in electronics. We do have a shared interest
in beer. Her rule is "one beer per wheel."

I wouldn't apply that rule with this stuff:
http://www.unibroue.com/products/fin.cfm