Bipolar Caps for decoupling? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, 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 26th March 2009, 06:06 PM   #1
diyAudio Member
 
jtsaudio's Avatar
 
Join Date: Dec 2007
Default Bipolar Caps for decoupling?

Can you use non-polar electrolytics as local (power supply) decoupling capacitors?

I've searched and found only threads about polar electrolytic caps as coupling caps...

My power amp's input diff-amp circuit specifies a 100uf/50v polar electrolytic, but all I have are some (high quality)220uf/50v non-polar electrolytics on hand.

Will these work ok?

If no, then why not ?

-Joe
  Reply With Quote
Old 26th March 2009, 06:17 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The nonpolar will work, they are capacitors.
You have paid a premium for the nonpolar capacity, that does not get used in this instance. This results in poor value.

Polar capacitors designed specifically for decoupling duty also sell at a premium, but in this case the extra performance is of some benefit. Maybe better value?
__________________
regards Andrew T.
  Reply With Quote
Old 26th March 2009, 06:28 PM   #3
diyAudio Member
 
jtsaudio's Avatar
 
Join Date: Dec 2007
Quote:
Polar capacitors designed specifically for decoupling duty also sell at a premium, but in this case the extra performance is of some benefit. Maybe better value?
Thanks Andrew, but what benefit, if any?

Does this mean that (in my case) Nichicon Muse polar caps will outperform the more expensive Muse NP types? Enough to warrant replacing these NP types?

While I'd spend a bit more for better results, are the NP's in any way inferior?

Anyone??

-Joe

  Reply With Quote
Old 26th March 2009, 07:05 PM   #4
clm811 is offline clm811  United States
diyAudio Member
 
clm811's Avatar
 
Join Date: May 2002
Location: Northern California
Hi Joe!

I have done this before and they worked fine; however, I don't know if they are any better/worse than polars in this application.

There's quite a bit written about using Black Gate N-series (nonpolar) as decoupling caps, so I don't see where there should be any problems using the Nichicons.

Maybe Andrew can elaborate on what benefits a high-grade polar cap would give (maybe related to ESR)?
  Reply With Quote
Old 27th March 2009, 07:09 AM   #5
diyAudio Member
 
jtsaudio's Avatar
 
Join Date: Dec 2007
Thanks Chas

It's not that I can't afford to buy good polar electrolytics, just that I had these lying around and I figure that if they're good enough quality for signal path, that they might be great in a power supply.

-Joe
  Reply With Quote
Old 28th March 2009, 07:04 PM   #6
diyAudio Member
 
Join Date: Nov 2008
Continuing on the same tangent, I recently came across a metallised polyster film capacitor series that is in standard production which goes as high as 470uF @ 63V. They're certainly wouldn't be cheap, and they're obviously quite chunky, but I guess they would definitely represent and interesting alternative to electrolytics....
And you'd only need 21 of them in parallel to form a 10,000uF @ 63V PSU cap !!!!
  Reply With Quote
Old 29th March 2009, 09:58 AM   #7
diyAudio Member
 
Join Date: Apr 2008
Default Caps

Goday Jts audio. Absolutely no advantage using bipolar caps in power supply . Why do it?? Can you give us a reason , Kind regards , Alan .
  Reply With Quote
Old 29th March 2009, 12:35 PM   #8
diyAudio Member
 
jtsaudio's Avatar
 
Join Date: Dec 2007
Quote:
Why do it? Can you give us a reason?
Please re-read post #5.

-Joe
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
tda1541 decoupling caps weegs Digital Line Level 8 7th December 2013 06:59 PM
PS decoupling caps in Gainclone ClaveFremen Chip Amps 26 7th February 2010 04:07 AM
Decoupling caps(again) argonrepublic Parts 2 10th May 2005 11:32 PM
decoupling caps argonrepublic Parts 4 8th May 2005 11:20 PM
decoupling caps question audiokid25 Parts 6 28th October 2004 10:56 PM


New To Site? Need Help?

All times are GMT. The time now is 02:32 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2