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

Best capacitors for power supplies update
Best capacitors for power supplies update
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 6th December 2017, 12:06 AM   #111
rebone is offline rebone
diyAudio Member
 
Join Date: Dec 2006
Location: europe
This has been my thinking as well. On the other hand, running 23v on 63v caps, some say that having too high safe margin will dry out the caps faster. Any thoughts on this.
Reason being that Epcos B4155 has 63v as lowest value at 10000uf.
Epcos B4155 does have 22000uf 40v, but higher uf value will supposedly give a slower amp?
Again any thoughts on this?
The output will be running on 23v 900 mA.
Thanks.
  Reply With Quote
Old 7th December 2017, 06:56 PM   #112
JeffYoung is offline JeffYoung  Ireland
diyAudio Member
 
JeffYoung's Avatar
 
Join Date: Jul 2017
Location: Ireland
Best capacitors for power supplies update
I've never heard of the drying-out issue. (Doesn't mean it doesn't exist....)

I've heard of the "slower amp" claim, but I've got to believe it's bollocks. There's certainly no physics behind it.

I'd use the 22,000 / 40V.
  Reply With Quote
Old 9th December 2017, 03:53 AM   #113
phase is offline phase  United States
diyAudio Member
 
Join Date: Oct 2004
I was browsing through the inventory at a (the) local electronics supply, where they keep surplus parts from eons ago on their shelves. A pair of large, shiny capacitors caught my attention, and when i picked them up, they were extremely light weight, I shook them and they rattled. I have no idea how old they are, but some of the film caps there are over 40 years old.
Are probably still on the shelf there...
  Reply With Quote
Old 10th December 2017, 08:25 PM   #114
dimkasta is offline dimkasta  Greece
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
Slower with bigger V rating? Really?
I always noticed quite the opposite and it always made sense to me because higher V comes with lower ESR.
__________________
Too many projects... so little time...
  Reply With Quote
Old 10th December 2017, 08:28 PM   #115
dimkasta is offline dimkasta  Greece
diyAudio Member
 
dimkasta's Avatar
 
Join Date: May 2010
Location: Athens
Btw i love playing with really nos parts. Have a loot at this puppy

Best capacitors for power supplies update-img_20171210_221842-jpg

Not for everything, but lovely for mid range frequencies

Like spice, you have to be careful with those
Attached Images
File Type: jpg IMG_20171210_221842.jpg (108.5 KB, 1015 views)
__________________
Too many projects... so little time...

Last edited by dimkasta; 10th December 2017 at 08:32 PM.
  Reply With Quote
Old 22nd November 2019, 06:24 AM   #116
ncclabs is offline ncclabs  Viet Nam
diyAudio Member
 
ncclabs's Avatar
 
Join Date: Mar 2017
I will use 32 capacitors parallel, maybe Pana FC, ELNA Silmic II
Attached Images
File Type: jpg DSC_1861.JPG (416.7 KB, 187 views)
File Type: jpg DSC_1865.JPG (426.7 KB, 189 views)
File Type: jpg DSC_1868.JPG (416.7 KB, 184 views)
File Type: jpg DSC_1889.JPG (391.8 KB, 52 views)
  Reply With Quote
Old 22nd November 2019, 02:47 PM   #117
sdaudio2 is offline sdaudio2  Canada
diyAudio Member
 
Join Date: Feb 2007
Location: ST.Thomas,Ontario,Canada
Have to check cap condition,DC working voltage rating(usually higher than what the cap will see in use),length ,height and width,terminal spacing,etc; before purchasing ...then look for suitable candidates online.Choose candidates with low esr and use a variac through a bridge rectifier to dial up to the working DC voltage on each cap (called reforming the cap)...with a meter observe how long it takes to discharge each cap when you remove power and time how long it takes...caps should be charged at least once a month...I forget the formula for how long to charge them per time on the shelf.When charging observe the jump in current on voltage application as there is a lag in response as the cap under test accepts forms up to the applied voltage and current will drop to zero as this happens...the longer it takes to form tells you how long this cap has been on the shelf...If after being charged for a long enough time and "it" is still leaking current,the,it might be e great ideal to discard said cap...oh,and don't for get to use a suitable load in line with your Plus line to your cap(calculate for whatever current you think will be useful and determine a suitable resistor and wattage rating)...I use a suitable variable DC power supply with lots of current reserve for charging with...If others have any suggestions,please chime in...Good Luck !
  Reply With Quote
Old 22nd November 2019, 03:00 PM   #118
carlmart is offline carlmart  Brazil
diyAudio Member
 
Join Date: Mar 2001
Location: Brazil
Is it alright to use a variable regulator, instead of a variac, to get to the working DC voltage?
  Reply With Quote
Old 22nd November 2019, 07:18 PM   #119
sdaudio2 is offline sdaudio2  Canada
diyAudio Member
 
Join Date: Feb 2007
Location: ST.Thomas,Ontario,Canada
Probably a good idea to have a variable something because of the cap charging current..to hit an uncharged cap may exceed the ability of your pwr supply to provide the neccessary current ...just wait till you start blowing fuses or somethin else...then you will know what I mean...
  Reply With Quote
Old 22nd November 2019, 07:23 PM   #120
sdaudio2 is offline sdaudio2  Canada
diyAudio Member
 
Join Date: Feb 2007
Location: ST.Thomas,Ontario,Canada
This caveat applies more to big caps(power supply)...expect it will take more current to charge them...and of course...the bigger the capacitance(given in micro farads or farads) the more demand on the pwr supply...This is why a variable regulated supply is ideal...start charging from zero volts but keep your eye on the miliamp meter for draw...
  Reply With Quote

Reply


Best capacitors for power supplies updateHide 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
Power Amp's NP capacitors and BP capacitors confuse ?? shehantha Solid State 11 2nd July 2016 12:41 PM
Choke power supplies for Class AB Power Amplifiers - which Rules for Calculating ?? tiefbassuebertr Solid State 12 3rd November 2011 09:47 AM
ATX (computer) power supplies for power amp robmonk Solid State 29 12th February 2005 06:06 AM
High voltage metal can oil capacitors for tube amp power supplies CCOZGO40 Swap Meet 1 3rd November 2002 09:10 PM
Regulated Power Supplies for Low Power Amps PTL60 Solid State 18 6th February 2002 07:24 AM


New To Site? Need Help?

All times are GMT. The time now is 09:49 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki