Feedthrough PI filter Question

Mar 17, 2008 6 Replies

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



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


Best regards, Spehro Pefhany


"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

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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.

Regards, Joerg http://www.analogconsultants.com/

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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

"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

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

And speaking of not driving, try this:

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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

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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.

Regards, Joerg http://www.analogconsultants.com/

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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

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Wow! Now that's a combination.

I wouldn't apply that rule with this stuff:

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Regards, Joerg http://www.analogconsultants.com/

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