Surface Mount Filters

[DFliyerz]

When pulling ceramic capacitors off of old circuit boards, I noticed lots of components that look like ceramic capacitors but tend to be darker and sometimes larger, and marked with "FL" or "FIL" to denote that they are signal filters. Does anyone know what these are made of, and if it's possible to recover anything from them? A quick Google search didn't reveal much, and I was even unable to find the name for this exact type.

 

[kdaddy]

Learn how to test for PM's... Pretty simple to do.

 

[shmandi]

It is hard to say without photo. It could be fuses but most likely they are inductors. I read once that some contain silver.

 

[johnny309]

Read the marking on them...the 3 leg type is 4.5,5.5,6.0,6.5 MHz(depending the country in which is used)....the 5 leg type is K followed by 4 numbers... you will find silver in both those types...not much .... mainly Cu,Si,

 

[MarcoP]

I'm following this thread with attention but I still don't understand what you guys are taking about. According to http://www.s-manuals.com/smd/fl those are everything but filters, could you please post a picture, I'm more and more curious.

Marco

 

[Geo]

http://lmgtfy.com/?q=SMD+type+capacitor+filter

 

[MarcoP]

http://lmgtfy.com/?q=SMD+type+capacitor+filter

Thanks Geo, that's the filters as I imagined but, as johnny309 say, none of them have 3 or 5 legs. That's where my curiosity increased.

Marco

 

[johnny309]

Maybe this help......

http://www.minikits.com.au/LTE6.5MB

http://www.aliexpress.com/item-img/EPCOS-SAW-filter-K9650M-38-9MHz-Special-2/1871797065.html

http://www.ebay.co.uk/itm/38-9Mhz-38-9-Mhz-CERAMIC-BANDPASS-FILTER-/201138928

http://1040034.en.makepolo.com/products/IF-Saw-Filter-with-Picture-Carrier-p42911006.html


P.S.: "If you don't find it on GOOGLE..... ask me"