Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Long term stabilty of Cerafines
Long term stabilty of Cerafines
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd April 2012, 02:30 PM   #1
analog_sa is offline analog_sa  Europe
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Cascais
Default Long term stabilty of Cerafines

I have a bunch of Elna Cerafines which i dearly love They must be around 10-12 years old, some used, some nos. As i needed to replace a large electrolytic in a crossover i thought i should give the Cerafines a try. To my surprise they all consistenly measured around 15% short of their rated capacitance.

Is this unusual? Are they drying out? Electrolytics are not known for accuracy and -15% is probably within stated limits, but i think most electrolytics err on the upside, while these are very consistently low.

Yes, tried reforming them. None of them needed it. Leakage current at rated voltage is a low 2uA.
  Reply With Quote
Old 24th April 2012, 01:23 PM   #2
analog_sa is offline analog_sa  Europe
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Cascais
Has no one else measured their Cerafines?
  Reply With Quote
Old 27th April 2012, 03:53 AM   #3
ticknpop is offline ticknpop  Canada
diyAudio Member
 
Join Date: May 2005
Location: toronto
I don't think they are not rated for the currents you'd see in a crossover. They are a cap for local power supply decoupling and signal coupling in line level applications. Mayve you have some of the big main filter caps that they don't make any more. I have some 22,000 uf ones, but my cap meter won't measure that high a value

Last edited by ticknpop; 27th April 2012 at 03:57 AM.
  Reply With Quote
Old 29th April 2012, 01:12 PM   #4
linuxguru is offline linuxguru  India
diyAudio Member
 
Join Date: Sep 2007
Send a message via Yahoo to linuxguru
Quote:
Originally Posted by analog_sa View Post
Has no one else measured their Cerafines?
I noticed the same 15-20% lower values for cerafines that have been in circuit for a decade. I'd say that this is typical for gradual dry-out of non-aqueous electrolytes - though the Cerafine's temperature rating of 85c could suggest an aqueous electrolyte also.
  Reply With Quote
Old 1st May 2012, 04:33 AM   #5
davidsrsb is offline davidsrsb  Malaysia
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
If the manufacturer can control their manufacturing process well enough, they make more profit by making capacitors below nominal value, while still in tolerance - less materials used. There is no guarantee that a 10 year old part still meets spec.
  Reply With Quote

Reply


Long term stabilty of CerafinesHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
MiniDSP Long Term Reliability. Any experience? blakkshepeaudio miniDSP 8 6th April 2011 08:12 AM
Long term serviceability of ESLs rick57 Planars & Exotics 22 29th August 2006 04:32 AM
are batteries a long term solution??? MegaMe Class D 1 15th November 2005 01:16 PM
Long term planning mashaffer Tubes / Valves 4 27th June 2005 10:45 AM


New To Site? Need Help?

All times are GMT. The time now is 10:54 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki