Aleph 2 capacitor ? - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 3rd November 2002, 09:05 AM   #1
diyAudio Member
 
Join Date: Oct 2002
Location: France
Default Aleph 2 capacitor ?

try to build aleph 2,
but I would like to know what I should take as Capacitor of power example:22000uf/40v or 22000uf/63V
it's a question

And where to buy them cheap (little price)
can you give me a name some of the shop or somebody

help please
__________________
stay zen
  Reply With Quote
Old 3rd November 2002, 09:24 AM   #2
diyAudio Member
 
wuffwaff's Avatar
 
Join Date: Aug 2001
Location: Ingolstadt Germany
Hi,


you´ll have to buy caps with a voltage rating a bit higher than the power supply voltage. How much higher has been discussed here before but anything about 10% above the supply voltage will do. So in the case of an Aleph2 (45V) you must look for 50V or higher.

Cheap capacitors are quite easy to obtain in surplus shops. The only problem is getting enough of the same sort.

william
__________________
een ooievaar is geen konijn want zijn oren zijn te klein!
  Reply With Quote
Old 3rd November 2002, 11:57 PM   #3
Bakmeel is offline Bakmeel  Netherlands
diyAudio Member
 
Bakmeel's Avatar
 
Join Date: Jan 2002
Location: The Netherlands
How much improvement would you get with improving the total capacity? Say, I'd double it and add a choke... Would it improve the sound much?

Bouke
__________________
More Power Igor! More Power!
  Reply With Quote
Old 4th November 2002, 07:30 PM   #4
diyAudio Member
 
Join Date: Oct 2002
Location: France
i don't undestand
Bouke
sorry
__________________
stay zen
  Reply With Quote
Old 5th November 2002, 11:47 PM   #5
Bakmeel is offline Bakmeel  Netherlands
diyAudio Member
 
Bakmeel's Avatar
 
Join Date: Jan 2002
Location: The Netherlands
Well, I guess it's just an obsession of mine, but I am a bit fond of big capacitor banks. I am in the assumption that it is good for the amp, and thus for the sound.

But I'm curious to know if it's really true! I recently heard that you can also have too much capacity.

And then again, Such elko's are expensive.. So I am wondering wether it is or isn't a waste of money to add capacity to the aleph 2 design...

Bouke
__________________
More Power Igor! More Power!
  Reply With Quote
Old 5th November 2002, 11:58 PM   #6
halojoy is offline halojoy  Sweden
On Hiatus
 
Join Date: Nov 2002
Default too much capacitance

You can not have too much capacitance.
That is: very much will not make things worse.

But at a certain value, the addition of more cap
will make so little difference,
that you can say there is no improvement.

So you can definitively have UNNESSESARY capacitance.
That is a waste of money.
And in that sense it can be described as "too much".
  Reply With Quote
Old 6th November 2002, 12:06 AM   #7
Bakmeel is offline Bakmeel  Netherlands
diyAudio Member
 
Bakmeel's Avatar
 
Join Date: Jan 2002
Location: The Netherlands
Well, this is what I heard about having too much capacity.. It's a bit contradictionary (is that a word? ), but here goes:

If you have too much capacity, you will have less ripple.. that is a goal. But in the mean while, the diodes in the rectifier bridge will only conduct for a very short period of time. That is, only when the voltage on the AC side is higher than the DC side.
I that time, a (large) current flows to refill the capacitors.
It's those peak current that makes the power supply restless and, it adds HF noise on your power rails.

But the solution is a bit stupid in my ears. You should decrease the capacity to have more ripple, so the loading peaks will be "longer" and thus add less HF noise to your power rails??

Confusing huh?

Bouke
__________________
More Power Igor! More Power!
  Reply With Quote
Old 6th November 2002, 08:47 AM   #8
diyAudio Member
 
wuffwaff's Avatar
 
Join Date: Aug 2001
Location: Ingolstadt Germany
Hi Bouke,

not confusing but difficult to know wich value to choose. That´s why I would go for a pi-filter setup with rel. small first capacitors (say 20-40mF for an Aleph 2) and then a large second bank (60-80mF). In between something like 2mH would do nicely.

This setup avoids large inrush currents AND keeps the ripple really low.

william
__________________
een ooievaar is geen konijn want zijn oren zijn te klein!
  Reply With Quote
Old 6th November 2002, 08:00 PM   #9
diyAudio Member
 
Join Date: Oct 2002
Location: France
Cool RE

hello women and men,
escuse my english
(hahahahahah)

I think sincerely that a big food of qualite,improve the music on all the busy band(strip). It is necessary filter the current of condensers with MKC 2,2 uf / 250v and to put a serie of 4700uf for the fast modulation for passing pointed and grave
__________________
stay zen
  Reply With Quote
Old 6th November 2002, 08:36 PM   #10
diyAudio Member
 
Join Date: Oct 2002
Location: Holland, The Hague
I'm not an electronics expert, but I heard (from somewhone who is) that you can have too much elco capacity in your powersupply.

It is suposed to make the amplifier "slow" (because the impedance increases with frequency, or someting). Is this true?

Bouke, hear is the link, (its in Dutch)
__________________
Is that all there is?
  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
Aleph 5 PS capacitor choices? - Revisited dantwomey Pass Labs 6 25th March 2003 04:47 AM
Aleph 5 PS capacitor choices? dantwomey Pass Labs 14 23rd March 2003 09:16 AM
Aleph 2, capacitor C9 and C10 loovet Pass Labs 3 10th January 2003 02:03 PM
Capacitor for Aleph 2 Cephas Pass Labs 3 12th April 2002 06:15 PM
Capacitor multiplier supply for ALEPH 3 hifi Pass Labs 47 5th February 2002 11:08 PM


New To Site? Need Help?

All times are GMT. The time now is 07:54 AM.


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