Hello all,
I can not get ceramic filters in my citu for 455, Only ceramic reasonators ( 2 pins) are available. Is it possible to use these resonators as filters and how?

any help is greatly appreciated.

rgards

 

Hello,

With crystals and resonators it is possible to create "crystal ladder filters".
In the following links there are examples and calculators to design it:
http://www.giangrandi.ch/electronics/crystalfilters/xtalfilters.shtml
http://users.tpg.com.au/users/ldbutler/LadderFilter.htm
http://lea.hamradio.si/~s57nan/ham_radio/xtl_fltr/xtl_fltr.html

Bertus