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.

Datasheets for 70s/80s electrolytics? (for ripple values etc)
Datasheets for 70s/80s electrolytics? (for ripple values etc)
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 20th September 2017, 01:48 AM   #11
Monte McGuire is offline Monte McGuire
diyAudio Member
 
Join Date: Jul 2013
Datasheets for 70s/80s electrolytics? (for ripple values etc)
I've noticed that some solid polymer caps (Oscon) have a failure mode where their leakage current slowly climbs to catastrophic levels, despite never exceeding the faceplate voltage level or asking it to handle ripple current of any significant magnitude.

This need for de-rating, combined with the difficulty of finding high faceplate voltage ratings makes them hard to use for higher voltage (>15V) uses. They're fantastic for CPU core voltage buck regulators handling huge HF ripple currents, but for standard HV linear circuits, they seem more annoying to handle than a standard wet Al electrolytic.
  Reply With Quote
Old 20th September 2017, 04:21 PM   #12
Elvee is offline Elvee  Belgium
diyAudio Member
 
Elvee's Avatar
 
Join Date: Sep 2006
Quote:
Originally Posted by zaib4tsu View Post
Thanks, I suspected as much.
Another question if you don't mind - what do you think of the recent "electric power steering" capacitor lines, eg. Chemicon GPD / GVD and Nichicon UBY?
Is there a catch I'm missing? LC is a little higher (0.03CV) than some "audio" capacitors, but comparable to Nichicon PW still.
I wasn't aware of these series, thanks for the pointers.

They look like a move in the right direction. Time will tell if there is a snag somewhere, but they are reputable manufacturers, which is reassuring


Quote:
Originally Posted by ej25awd View Post
Solid polymer electrolytics have VERY high leakage current. It is not suitable for audio AC bypass and coupling duties unless high output DC offset and noisy volume controls is your thing.
Some (but not all) may have a highish leakage, but anyway using them for coupling looks like huge overkill, because the low esr etc. is completely wasted. For bypass applications, they should shine, except perhaps in very marginal cases

Quote:
Originally Posted by Monte McGuire View Post
I've noticed that some solid polymer caps (Oscon) have a failure mode where their leakage current slowly climbs to catastrophic levels, despite never exceeding the faceplate voltage level or asking it to handle ripple current of any significant magnitude.
I have never encountered such a case, yet we use them by the 10,000's, but it's probably something specific to one manufacturer
Quote:
This need for de-rating, combined with the difficulty of finding high faceplate voltage ratings makes them hard to use for higher voltage (>15V) uses. They're fantastic for CPU core voltage buck regulators handling huge HF ripple currents, but for standard HV linear circuits, they seem more annoying to handle than a standard wet Al electrolytic.
They are not suited to high voltage applications (so far), but Al wet caps are still the only ones reaching 450V.
Even wet tantalum are limited in this respect
__________________
. .Circlophone your life !!!! . .
♫♪ My little cheap Circlophoneİ ♫♪
  Reply With Quote

Reply


Datasheets for 70s/80s electrolytics? (for ripple values etc)Hide 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
what are good AC values for B+ ripple at 480VDC Planobilly Instruments and Amps 7 2nd December 2016 11:00 PM
LM3886 Power Supply Ripple and using a DMM on AC to measure Ripple swamp Chip Amps 6 27th January 2016 04:53 PM
PP PSU: How much ripple is too much ripple? DrewP Tubes / Valves 10 11th September 2011 05:59 AM
Intermodulation Distortion Values below THD Values by SS Amps - is this possible ?? tiefbassuebertr Solid State 28 30th May 2011 11:20 AM
ripple values in B+ supply Antonio Tucci Tubes / Valves 3 3rd September 2006 08:53 AM


New To Site? Need Help?

All times are GMT. The time now is 02:24 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki