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metalized polypropylene vs metallized polyester? - Page 2

post #16 of 22
Ceramics are very good - in the right place (decoupling and compensation mostly)! I have no fear...
post #17 of 22
If you need very low value capacitor in signal path, silver Mica is used quite often instead of a ceramic cap. But for compensation caps, I do use NPO. Starting from hundred pF, you can get polypropylene caps from Panasonic.
post #18 of 22

Thank you, Morsel ...

 

My application is a dc multiplier running at 100 Khz ....

post #19 of 22

Behold, I am the necromancer. Hello 2003.

 

What do you guys think about these polyester caps?

Am I wrong in assuming these would make amazing decoupling and bypass caps? Or does the fact it is polyester ruin it?

post #20 of 22
Quote:
Originally Posted by coinmaster View Post
 

Behold, I am the necromancer. Hello 2003.

 

What do you guys think about these polyester caps?

Am I wrong in assuming these would make amazing decoupling and bypass caps? Or does the fact it is polyester ruin it?

 

Well, let's see ... the shortest of those is still 1.4" tall and the mounting hole spacing is almost 4" on all of them.  Meanwhile, the cheapest one of those available at Mouser is only $71.01.

 

So yeah ... have at it. ;);)

post #21 of 22
12 year old thread resurrection? This is a record for me.
If you want to try very large film capacitors why not go for Solen? They are polypropylene and are made for this purpose (audio). No point gong for polyester if you're set on using a physically huge capacitor already.
post #22 of 22

Just line up some 100uF+ Solen, Axon, Mundorf MKPs, or ClarityCap PXs in parallel (My personal choice is the ClarityCaps). Every article or post I've ever read about implementing polyester caps for audio applications takes a dump on them. 

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